humic

from WordNet (r) 3.0 (2006)

humic
    adj 1: of or relating to or derived from humus; "humic acid"

from The Collaborative International Dictionary of English v.0.48

Humic \Hu"mic\, a. [L. humus the earth, ground: cf. F. humique.]
   (Chem.)
   Pertaining to, or derived from, vegetable mold; as, humic
   acid. See {Humin}.
   [1913 Webster]