gein \ge"in\ (j[=e]"[i^]n), n. [Gr. gh^ earth.] (Chem.) See {Humin}. [1913 Webster]
Humin \Hu"min\, n. [L. humus the earth, ground.] (Chem.) 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. [1913 Webster]