non-humus

humus

[hyoo-muhs or, often, yoo-]
noun
the dark organic material in soils, produced by the decomposition of vegetable or animal matter and essential to the fertility of the earth.

Origin:
1790–1800; < Latin: earth, ground; akin to Greek chamaí on the ground, chthṓn earth, Sanskrit kṣam-, Lithuanian žẽmė, Serbo-Croatian zèmlja ground, earth; cf. chameleon, chthonian, zemstvo; see Homo

nonhumus, noun
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Collins
World English Dictionary
humus (ˈhjuːməs)
 
n
a dark brown or black colloidal mass of partially decomposed organic matter in the soil. It improves the fertility and water retention of the soil and is therefore important for plant growth
 

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Etymonline
Word Origin & History

humus
1796, from L. humus "earth, soil," probably from humi "on the ground," from PIE *ghom- (cf. Gk. khamai "on the ground," Lith. zeme, O.C.S. zemlja "earth," L. humilis "low").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
humus   (hy'məs)  Pronunciation Key 
A dark-brown or black organic substance made up of decayed plant or animal matter. Humus provides nutrients for plants and increases the ability of soil to retain water.
The American Heritage® Science Dictionary
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