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The Collaborative International Dictionary
vitamin B complex

vitamin B complex \vitamin B complex\ n. a mixture of water-soluble vitamins originally thought to be a single vitamin but now known to be a mixture of several compounds with vitaminic activity.

Syn: B complex, vitamin B complex, vitamin B, B vitamin.

Wiktionary
vitamin b complex

n. A group of water-soluble vitamins, once thought to be a single vitamin, occurring in yeast, liver, eggs etc.

WordNet
vitamin B complex

n. originally thought to be a single vitamin but now separated into several B vitamins [syn: B-complex vitamin, B complex, vitamin B, B vitamin, B]