leaf
1 Americannoun
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one of the expanded, usually green organs borne by the stem of a plant.
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any similar or corresponding lateral outgrowth of a stem.
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a petal.
a rose leaf.
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leaves collectively; foliage.
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Bibliography. a unit generally comprising two printed, blank, or illustrated pages of a book, one on each side.
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a thin sheet of metal.
silver leaf.
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a lamina or layer.
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a sliding, hinged, or detachable flat part, as of a door or tabletop.
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a section of a drawbridge.
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a single strip of metal in a leaf spring.
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a tooth of a small gear wheel, as of a pinion.
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Textiles. shaft.
verb (used without object)
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to put forth leaves.
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to turn pages, especially quickly (usually followed bythrough ).
to leaf through a book.
verb (used with object)
idioms
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in leaf, covered with foliage; having leaves.
the pale green tint of the woods newly in leaf.
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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.
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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.
noun
noun
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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
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foliage collectively
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(of shrubs, trees, etc) having a full complement of foliage leaves
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one of the sheets of paper in a book
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a hinged, sliding, or detachable part, such as an extension to a table
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metal in the form of a very thin flexible sheet
gold leaf
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a foil or thin strip of metal in a composite material; lamina
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short for leaf spring
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the inner or outer wall of a cavity wall
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a crop that is harvested in the form of leaves
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a metal strip forming one of the laminations in a leaf spring
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a slang word for marijuana
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to imitate someone, esp in one particular course of action
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to begin a new and improved course of behaviour
verb
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to turn (through pages, sheets, etc) cursorily
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(intr) (of plants) to produce leaves
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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leafsimple
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leafssimple
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have leafedperfect
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has leafedperfect
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am leafingprogressive
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are leafingprogressive
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is leafingprogressive
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have been leafingperfect progressive
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has been leafingperfect progressive
Past
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leafedsimple
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had leafedperfect
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was leafingprogressive
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were leafingprogressive
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had been leafingperfect progressive
Future
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.
Vocabulary lists containing leaf
Stump Speech: Tree Terminology
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Life Science: Plants
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Photosynthesis - Middle School
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
After dark, it descends more than 50 centimeters and creates an anchor point on a leaf, branch, or the forest floor.
From Science Daily • Jun. 26, 2026
After nightfall, it drops down some 50cm to a leaf, a branch or the forest floor and creates an anchor point using a silk line.
From BBC • Jun. 23, 2026
Trump said Tuesday he had accepted Macron's offer of dinner at Versailles as the palace of the French Sun King Louis XIV is "not gold leaf" but the "real deal".
From Barron's • Jun. 17, 2026
Remember, it’s gold leaf: Below the gilding, the rest of the figure is made of bronze.
From Slate • Jun. 2, 2026
It was just the tiniest edge of the leaf that had shriveled and curled under, but it was enough to see that the stem underneath was soft and pulpy.
From "Nory Ryan’s Song" by Patricia Reilly Giff
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.