noun a mixture; a compound.
2. compost ·vt to manure with compost.
3. compost ·vt to mingle, as different fertilizing substances, in a mass where they will decompose and form into a compost.
4. compost ·noun a mixture for fertilizing land; ·esp., a composition of various substances (as muck, mold, lime, and stable manure) thoroughly mingled and decomposed, as in a compost heap.