Humin

[hju:min]

Definition

(noun.) a black humic substance that is not soluble in water.

Checked by Dale--From WordNet

Definition

(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.

Inputed by Elliot