Plural of compost; mixtures of decayed organic matter used for enriching soil, or third-person singular present tense of the verb compost.
From Middle French 'composte' plus English -s for plural or third-person singular verb form. The word blends French and Latin roots.
Industrial-scale composting now recycles billions of tons of food waste annually, and some cities ban compostable material from landfills—composting is becoming infrastructure, not just gardening hobby.
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