lemon

American  

[lem-uhn] / ˈlɛm ən /

noun

1. the yellowish, acid fruit of a subtropical citrus tree, Citrus limon.

2. the tree itself.

3. lemon yellow.

4. Informal. a person or thing that proves to be defective, imperfect, or unsatisfactory; dud.

   His car turned out to be a lemon.

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adjective

1. made of or with lemon.

2. having the color, taste, or odor of lemon.

lemon British  

/ ˈlɛmən /

noun

1. a small Asian evergreen tree, Citrus limon, widely cultivated in warm and tropical regions, having pale green glossy leaves and edible fruits

2. 1. the yellow oval fruit of this tree, having juicy acidic flesh rich in vitamin C

   2. ( as modifier )

      a lemon jelly

3. Also called: lemon yellow. 

   1. a greenish-yellow or strong yellow colour

   2. ( as adjective )

      lemon wallpaper

4. a distinctive tart flavour made from or in imitation of the lemon

5. slang a person or thing considered to be useless or defective

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Other Word Forms

• lemon-like adjective
• lemonish adjective
• lemonlike adjective
• lemony adjective

Etymology

Origin of lemon

1350–1400; 1905–10 lemon for def. 4; < Medieval Latin lemōnium; replacing Middle English lymon < Medieval Latin līmō, (stem līmōn- ) < Persian līmū, līmun

Explanation

A lemon is a sour yellow fruit. Squeeze one to make lemonade or add flavor to hot tea. Lemon is also what people call something that doesn’t work well, like a bum car. You can use the word lemon for the evergreen tree whose blossoms become bright yellow fruit, or for the fruit itself — or even the color of the fruit. Lemons are originally from Asia, but they also grow well in the Mediterranean, Florida, and California. They like sunny places. Informally, you can also use lemon to mean "an unsatisfactory or poorly made example of something," so you could say, "Most Volvos are great, but this car is a lemon."

Example Sentences

Fresh lemon juice adds vibrancy, while freshly grated Parmesan cheese, which is cooked in the sauce and sprinkled on top of the served pasta, adds a beautiful nuttiness.

From Salon • May 1, 2026

The Aire Sutileza Elixir is floral, fresh and earthy, featuring notes of pear, lemon, jasmine sambac, vetiver, sandalwood and musk.

From Los Angeles Times • Apr. 17, 2026

For brightness, add lemon zest — the aromatic lift without the watery slack.

From Salon • Apr. 14, 2026

Two crossing paths divide the space into four quarters planted with lavender and potted lemon trees.

From The Wall Street Journal • Apr. 11, 2026

Scoob’s known G’ma going on twelve years and has never seen her drink anything other than water and unsweet tea with a quarter of a lemon squeezed over the top.

From "Clean Getaway" by Nic Stone