Entry 2 senses · 2 variants Webster, 1913 Glaucine · Glau·cine · IPA a. n. 01 a. Glaucous or glaucescent. 1. Glaucous or glaucescent. 02 n. An alkaloid obtained from the plant Glaucium flavum, as a bitter, white, crystalline substance. 1. An alkaloid obtained from the plant Glaucium flavum, as a bitter, white, crystalline substance.(Chem.)