vitamin b(n = noun.substance) b, b complex, b vitamin, b-complex vitamin, vitamin b complex - originally thought to be a single vitamin but now separated into several B vitamins;
is a kind of water-soluble vitamin
has particulars: choline, inositol, pantothen, pantothenic acid, aneurin, antiberiberi factor, thiamin, thiamine, vitamin b1, antipernicious anemia factor, cobalamin, cyanocobalamin, vitamin b12, hepatoflavin, lactoflavin, ovoflavin, riboflavin, vitamin b2, vitamin g, adermin, pyridoxal, pyridoxamine, pyridoxine, vitamin b6, folacin, folate, folic acid, pteroylglutamic acid, pteroylmonoglutamic acid, vitamin bc, vitamin m, niacin, nicotinic acid, biotin, vitamin h

   a group of water-soluble vitamins originally thought to be a single vitamin but now separated into several B vitamins. [WordNet 1.5]

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