from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The part of the organic matter in soil that does not dissolve in dilute alkali
from the GNU version of the Collaborative International Dictionary of English
- n. A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid, ulmin, gein, ulmic or geic acid, etc.
from The Century Dictionary and Cyclopedia
- n. A neutral indifferent substance said by Mulder to exist in black humus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a black humic substance that is not soluble in water
Sorry, no etymologies found.