compost

American  

[kom-pohst] / ˈkɒm poʊst /

noun

1. a mixture of various decaying organic substances, as dead leaves or manure, used for fertilizing soil.

2. a composition; compound.

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verb (used with object)

1. to use in compost; make compost of.

   to compost manure and kitchen scraps.

2. to apply compost to (soil).

verb (used without object)

1. to make compost.

   Shredded leaves will compost easily.

compost British  

/ ˈkɒmpɒst /

noun

1. a mixture of organic residues such as decomposed vegetation, manure, etc, used as a fertilizer

2. a mixture, normally of plant remains, peat, charcoal, etc, in which plants are grown, esp in pots

3. rare a compound or mixture

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verb

1. to make (vegetable matter) into compost

2. to fertilize with compost

compost Scientific  

/ kŏm′pōst′ /

1. A mixture of decayed or decaying organic matter used to fertilize soil. Compost is usually made by gathering plant material, such as leaves, grass clippings, and vegetable peels, into a pile or bin and letting it decompose as a result of the action of aerobic bacteria, fungi, and other organisms.

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Other Word Forms

• compostable adjective
• composter noun

Etymology

Origin of compost

1350–1400; Middle English < Anglo-French, Middle French < Latin compositum, noun use of neuter of compositus composite; compote

Explanation

Compost is organic matter like orange peels and coffee grounds mixed together and left to decay, usually in a compost pile, then used as fertilizer. To make such a mixture is to compost. To compost is to make a mixture of organic matter, such as manure and leftover food, and leave it somewhere like a compost pile in the back yard or in a bucket with a tight lid in the kitchen. The mixture is also called compost, and after it sits and decays for a while, voila! It turns into fertilizer that makes the soil rich and the plants happy.

Example Sentences

And for Michael, who loves gardening and growing flowers, it is collecting food waste for compost.

From BBC • Mar. 7, 2026

An average-size adult yields about 200 pounds of compost from Meine Erde’s method, which uses less water, Metz said.

From The Wall Street Journal • Feb. 3, 2026

"Ongoing work is focused exclusively on compost, and we seem to be getting the same results," Cease says.

From Science Daily • Jan. 24, 2026

Stewart opted out of the burial/cremation dichotomy, saying she wanted to become compost.

From Salon • Dec. 9, 2025

Salatin reached down deep where his pigs were happily rooting and brought a handful of fresh compost right up to my nose.

From "The Omnivore's Dilemma" by Michael Pollan

Related Words

• fertilizer