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The Collaborative International Dictionary
vitamin K1

vitamin K1 \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..

Wiktionary
vitamin k1

n. phylloquinone

WordNet
vitamin K1

n. a form of vitamin K [syn: phylloquinone, phytonadione]