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]