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noun vitamin K3 n. Menadione, (C11H8O2) being chemically 2-methyl-1,4,-naphthoquinone. Having no side chain in the 3 position, it cannot exert all functions of a true K vitamin and the designation as vitamin K3 has been discouraged Synonyms: vitaminK2(0); menaphthone.
Collaborative International Dictionary of English 0.48
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