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• leaf
  leaf

  noun

  one of the expanded, usually green organs borne by the stem of a plant.
• Leaf
  Leaf

  noun

  Munro 1905–76, U.S. author and illustrator of books for children.

leaf

¹ American  

[leef] / lif /

noun

• leaves
  plural

1. one of the expanded, usually green organs borne by the stem of a plant.

2. any similar or corresponding lateral outgrowth of a stem.

3. a petal.

   a rose leaf.

4. leaves collectively; foliage.

5. Bibliography. a unit generally comprising two printed, blank, or illustrated pages of a book, one on each side.

6. a thin sheet of metal.

   silver leaf.

7. a lamina or layer.

8. a sliding, hinged, or detachable flat part, as of a door or tabletop.

9. a section of a drawbridge.

10. a single strip of metal in a leaf spring.

11. a tooth of a small gear wheel, as of a pinion.

12. leaf fat.

13. Textiles. shaft.

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verb (used without object)

• leafs,
  present (3rd person singular)
• leafed,
  past participle,  past
• leafing
  present participle

1. to put forth leaves.

2. to turn pages, especially quickly (usually followed bythrough ).

   to leaf through a book.

verb (used with object)

• leafs,
  present (3rd person singular)
• leafed,
  past participle,  past
• leafing
  present participle

1. to thumb or turn, as the pages of a book or magazine, in a casual or cursory inspection of the contents.

idioms

1. in leaf, covered with foliage; having leaves.

   the pale green tint of the woods newly in leaf.

2. take a leaf out of / from someone's book, to follow someone's example; imitate.

   Some countries that took a leaf out of American industry's book are now doing very well for themselves.

3. turn over a new leaf, to begin anew; make a fresh start.

   Every New Year's we make resolutions to turn over a new leaf.

Leaf ² American  

[leef] / lif /

noun

1. Munro 1905–76, U.S. author and illustrator of books for children.

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leaf British  

/ liːf /

noun

1. the main organ of photosynthesis and transpiration in higher plants, usually consisting of a flat green blade attached to the stem directly or by a stalk

2. foliage collectively

3. (of shrubs, trees, etc) having a full complement of foliage leaves

4. one of the sheets of paper in a book

5. a hinged, sliding, or detachable part, such as an extension to a table

6. metal in the form of a very thin flexible sheet

   gold leaf

7. a foil or thin strip of metal in a composite material; lamina

8. short for leaf spring

9. the inner or outer wall of a cavity wall

10. a crop that is harvested in the form of leaves

11. a metal strip forming one of the laminations in a leaf spring

12. a slang word for marijuana

13. to imitate someone, esp in one particular course of action

14. to begin a new and improved course of behaviour

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verb

1. to turn (through pages, sheets, etc) cursorily

2. (intr) (of plants) to produce leaves

leaf Scientific  

/ lēf /

1. An appendage growing from the stem of a plant. Leaves are extremely variable in form and function according to species. For example, the needles of pine trees, the spines of cacti, and the bright red parts of the poinsettia plant are all leaves modified for different purposes. However, most leaves are flat and green and adapted to capturing sunlight and carbon dioxide for photosynthesis. They consist of an outer tissue layer (the epidermis) through which water and gases are exchanged, a spongy inner layer of cells that contain chloroplasts, and veins that supply water and minerals and carry out food. Some leaves are simple, while others are compound, consisting of multiple leaflets. The flat part of the leaf, the blade, is often attached to the stem by a leafstalk.

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leaf More Idioms  

More idioms and phrases containing leaf

• quake in one's boots (like a leaf)
• take a leaf out of someone's book
• turn over a new leaf

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Other Word Forms

Derived Forms

• leaflessness
  noun
• unleaf
  verb (used with object)
• leafless
  adjective
• leaflike
  adjective
• unleaflike
  adjective

Inflected Forms

Nouns

• leaves
  plural

Participles

• leafing
  present
• leafed
  past

Conjugated Forms

Present

• leaf
  simple
• leafs
  simple
• have leafed
  perfect
• has leafed
  perfect
• am leafing
  progressive
• are leafing
  progressive
• is leafing
  progressive
• have been leafing
  perfect progressive
• has been leafing
  perfect progressive

Past

• leafed
  simple
• had leafed
  perfect
• was leafing
  progressive
• were leafing
  progressive
• had been leafing
  perfect progressive

Future

• will leaf
  simple
• will have leafed
  perfect
• will be leafing
  progressive
• will have been leafing
  perfect progressive

Etymology

Origin of leaf

First recorded before 900; Middle English leef, lef, Old English lēaf; cognate with Dutch loof, German Laub, Old Norse lauf, Gothic laufs

Explanation

A leaf is part of a plant that's usually green and attached to it by a stem or stalk. In the fall, the leaves of many trees turn various bright colors before falling to the ground. In the spring, trees grow new leaves. Ahhh, the circle of life. A plant's leaves are the organs that take part in photosynthesis, which brings it needed nutrients. From this botanical meaning comes another definition of leaf, "a sheet of printed paper or a page in a book." And when you leaf through a book, you turn its pages. You might also "tremble like a leaf," or shake with fear; or "turn over a new leaf," start a new part of your life with new resolutions or attitudes.

Example Sentences

See Examples For:

leaf Leaf leaves leafs leafed leafing

Richard and Naomi make regular visits to the hospital's Rainbow Garden, where Bella has a glass leaf in her memory.

From BBC ● Sep. 15, 2026

At the surface, the foam develops an extremely rough texture that strongly repels water, much like the surface of a lotus leaf.

From Science Daily ● Sep. 10, 2026

“With Zephyr, it’s like you can really appreciate all the little things, because he is interested in every leaf, and every stick, and every bug. It’s like a moment of zen.”

From Los Angeles Times ● Sep. 8, 2026

When a Canadian puts a maple leaf flag on his backpack, he isn’t simply saying, “I love Canada”; he’s also saying, “Don’t confuse me for an American, bud.”

From The Wall Street Journal ● Sep. 2, 2026

I could not see a leaf anywhere on the dry gray branches.

From This Side of Wild by Gary Paulsen

The missing Indians were in the country with three travel agencies: Samrat Tours & Travels, Leaf Holiday and Himalayan Glacier.

From Barron's ● Aug. 26, 2026

“They are all looking for bypasses,” Leaf, the former senior State Department official, said of Arab Gulf states.

From The Wall Street Journal ● Aug. 5, 2026

As battery technology has advanced, EVs have avoided problems like the ones that plagued the original Nissan Leaf when it hit the market in 2010, for example.

From The Wall Street Journal ● Jul. 5, 2026

"Sales are taking much longer and it is proving increasingly difficult to generate commitment," said Jeremy Leaf, a estate agent in north London.

From BBC ● Jun. 29, 2026

Leaf blister, sooty mold, oak wilt, leaf scorch: Been there, done that.

From "Wishtree" by Katherine Applegate

Many species can go unnoticed among fallen leaves, rotting wood and the bases of trees, but Benwell said taking the time to look more closely opens up a hidden world.

From BBC ● Sep. 27, 2026

Sixteen of the compounds were tentatively identified as flavoalkaloids, providing the first evidence that this rare class of chemicals occurs in Cannabis leaves.

From Science Daily ● Sep. 26, 2026

That leaves few paths for growth for someone as senior as Baratta, 55.

From The Wall Street Journal ● Sep. 25, 2026

He said these statistical traces are akin to "fingerprints that a criminal leaves at a crime scene."

From Barron's ● Sep. 25, 2026

Being alone in the dark house with Patch, or having nothing to eat but warm water with a few leaves floating around on top?

From "Nory Ryan’s Song" by Patricia Reilly Giff

Fans marched to last Thursday’s afternoon game with Qatar wearing Canadian flags draped over their shoulders and headdresses that sprouted small maple leafs.

From Los Angeles Times ● Jun. 23, 2026

Liudmyla leafs through an old photo album containing images of Mykola’s paintings, the closest thing he has to an artist’s monograph, and then brings out a few of the originals she’s packed away for safe-keeping.

From Seattle Times ● Jan. 29, 2024

Walking with Gregory6 in bare treed October ash woods—winds blowing brown sere leafs at feet—talking of dead Jack—the sky an old familiar place with fragrant eyebrow clouds passing overhead in Fall Current—

From The New Yorker ● Oct. 20, 2019

The barely rustling leafs almost spoiled the effect.

From New York Times ● Jun. 12, 2019

The only clothes he was wearing was the bottom half of a woman’s dress that looked like it waren’t nothing but a bunch of long leafs sewed together.

From "Elijah of Buxton" by Christopher Paul Curtis

While Steve’s dad leafed through documents and letters—stopping to exclaim or lament a bit—and Steve went through still more photos, I dug through his late mom’s sewing supplies.

From The Wall Street Journal ● Dec. 4, 2025

Back at my tiny Airbnb above a Chinese supermarket, I leafed through it.

From BBC ● Sep. 19, 2024

It’s just a 5-foot skinny stick now, but it has leafed out and is so beautiful and full of promise.

From Seattle Times ● May 24, 2024

Standing in the chill before the courthouse opened, Macias leafed through the petition detailing her husband’s psychiatric history.

From Los Angeles Times ● Feb. 10, 2024

I pulled out the field guide with its blue canvas cover and leafed through the pages.

From "The Line Tender" by Kate Allen

Spend enough time cooking — or leafing through cookbooks in bed — and you notice certain ingredients keep reaching for one another.

From Salon ● Aug. 1, 2026

Shortly after opening time on a recent morning, the Kettering store already had a number of middle-aged customers milling about the space leafing through magazines—yes, it has those—or asking for advice.

From The Wall Street Journal ● Jun. 25, 2026

Leo Kelly—a devout Christian Iowan who was seen ascending the Senate dais, leafing through sensitive documents, and praying in the chamber—described it as “a blessing.”

From Slate ● May 28, 2026

Trees only delay leafing after actual infestations, which prevents insects from adapting to the change over time.

From Science Daily ● May 5, 2026

The old man, meanwhile, was leafing through the book, without seeming to want to return it at all.

From "The Alchemist" by Paulo Coelho

Related Words

• frond
• needle
• petal
• stalk