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humus

[hyoo-muh s or, often, yoo-] /ˈhyu məs or, often, ˈyu-/
noun
1.
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
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
Related forms
nonhumus, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for non-humus

humus

/ˈhjuːməs/
noun
1.
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
Word Origin
C18: from Latin: soil, earth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for non-humus

humus

n.

1796, from Latin humus "earth, soil," probably from humi "on the ground," from PIE *dhghem- "earth" (cf. Latin humilis "low;" see chthonic). Related: Humous (adj.).

Online Etymology Dictionary, © 2010 Douglas Harper
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non-humus in Science
humus
  (hy'məs)   
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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