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noun vitamin K1 n. One of the two K vitamins, (C31H46O2). It is fat-soluble and occurs naturally as the trans isomer. Chemically it is 2-methyl-3-phytyl-1,4,-naphthoquinone. Synonyms: phylloquinone, phytonadione, antihemorrhagic vitamin..
Collaborative International Dictionary of English 0.48
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