Entry 1 sense Webster, 1913 geic /(jē"ĭk)/ · ge·ic · IPA /ˈd͡ʒi.ɪk/ 01 a. Pertaining to, or derived from, earthy or vegetable mold. 1. Pertaining to, or derived from, earthy or vegetable mold.(Chem.) Phrases & compounds geic acid — See Humin.