compost (n.) Look up compost at
late 14c., compote, from Old French composte "mixture of leaves, manure, etc., for fertilizing land" (13c.), also "condiment," from Vulgar Latin *composita, noun use of fem. of Latin compositus, past participle of componere "to put together" (see composite). The fertilizer sense is attested in English from 1580s, and the French word in this sense is a 19th century borrowing from English.
compost (v.) Look up compost at
"make into compost," 1829, from compost (n.). Related: Composted; composting.