The Collaborative International Dictionary of English v.0.48:
vitamin G \vitamin G\ n. same as vitamin B2. Syn: vitamin B2, riboflavin, lactoflavin, ovoflavin, hepatoflavin. [WordNet 1.5]WordNet (r) 3.0 (2006):
vitamin G n 1: a B vitamin that prevents skin lesions and weight loss [syn: vitamin B2, vitamin G, riboflavin, lactoflavin, ovoflavin, hepatoflavin]