GNU Collaborative International Dictionary of English

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1.       
   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.
   
   Syn. -- phylloquinone, phytonadione, antihemorrhagic vitamin..
   
   [WordNet 1.5 +PJC]