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riboflavin (n.)

growth-promoting substance also known as vitamin B2, 1935, from German Riboflavin (1935), from ribo-, combining form of ribose + flavin, from Latin flavus "yellow" (see blue (adj.1)); so called from its color. Also sometimes known as lactoflavine, as it is found in milk.

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Definitions of riboflavin from WordNet

riboflavin (n.)
a B vitamin that prevents skin lesions and weight loss;
Synonyms: vitamin B" / vitamin G / lactoflavin / ovoflavin / hepatoflavin
From wordnet.princeton.edu