One who composts or manages compost; a person engaged in composting or waste management.
Agent noun formed from 'compost' (decomposed organic matter used as fertilizer) plus the suffix '-er.' The word 'compost' comes from Latin 'compositum' (put together), and emerged in English in the 1600s for prepared manure.
As composting becomes more popular for environmental reasons, 'compester' is a newly useful word—it describes people managing waste sustainably. Language adapts to new needs: we didn't need this word before composting became widespread!
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