Humus

·noun That portion of the soil formed by the decomposition of animal or vegetable matter. It is a valuable constituent of soils.

humus
hŭmus, i (archaic form of the abl. sing. humu, Varr. ap. Non. 488, 6 and 48, 26), f. (archaic masc. ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
humus
humus ī, f cf. χαμαί, the earth, ground, soil : infecta sanguine, S.: subacta atque pura: Fossa re...

An Elementary Latin Dictionary