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vitamin K1

noun
1.
a yellowish, oily, viscous liquid, C 31 H 46 O 2 , occurring in leafy vegetables, rice, bran, hog liver, etc., or obtained especially from alfalfa or putrefied sardine meat, or synthesized, that promotes blood clotting by increasing the prothrombin content of the blood.
Also called phylloquinone, phytonadione.
Origin
1930-1935
1930-35

vitamin K2

noun
1.
a light-yellow, crystalline solid, C 41 H 56 O 2 , having properties similar to those of vitamin K 1 .

vitamin K3

noun
1.

menadione

[men-uh-dahy-ohn] /ˌmɛn əˈdaɪ oʊn/
noun, Pharmacology
1.
a synthetic yellow crystalline powder, C 1 1 H 8 O 2 , insoluble in water, used as a vitamin K supplement.
Also called vitamin K3.
Origin
1940-45; me(thyl) + na(phthalene) + di-1 + -one
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for vitamin k

vitamin K

noun (pl) K vitamins
1.
any of the fat-soluble vitamins, including phylloquinone and the menaquinones, which are essential for the normal clotting of blood

menadione

/ˌmɛnəˈdaɪəʊn/
noun
1.
a yellow crystalline compound used in fungicides and as an additive to animal feeds. Formula: C11H8O2 Also vitamin K3
Word Origin
C20: from me(thyl) + na(phtha) + di-1 + -one

vitamin K1

noun
1.
another name for phylloquinone

vitamin K2

noun
1.
another name for menaquinone

vitamin K3

noun
1.
a former name for menadione
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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vitamin k in Medicine

menadione men·a·di·one (měn'ə-dī'ōn')
n.
A synthetic vitamin K derivative occurring as a yellow crystalline powder and used as a vitamin K supplement.

vitamin K n.
Any of several fat-soluble compounds that are found in alfalfa, hog liver, fish meal, and vegetable oils and are essential for the production of normal amounts of prothrombin. Also called antihemorrhagic factor.

vitamin K1 n.
A yellow viscous oil found in leafy green vegetables or made synthetically, used by the body to form prothrombin.

vitamin K2 n.
Any of various yellowish crystalline compounds isolated from putrefied fish meal or from various intestinal bacteria and used to stop hemorrhaging. Also called menaquinone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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vitamin k in Science
vitamin K  
Any of a group of fat-soluble vitamins that are involved in the formation of prothrombin and other clotting factors in the liver and are essential for normal clotting of the blood. (The K is derived from the German word koagulation.) Vitamin K is also involved in bone formation and repair. Two forms occur naturally: vitamin K1, which is synthesized by plants, and vitamin K2, which is mainly synthesized by intestinal bacteria. The other forms are synthetic substances with similar chemical structures.
vitamin K1  
The major dietary form of vitamin K that is synthesized in plants and found primarily in green, leafy vegetables such as alfalfa and in vegetable oils. It can be made synthetically and is given orally to treat prothrombin deficiency that results from heparin and other anticoagulant drugs. Also called phylloquinone. Chemical formula: C31H46O2.
vitamin K2  
A form of vitamin K that is synthesized by bacteria in the intestine and is also found in fish and other foods. Also called menaquinone. Chemical formula: C41H56O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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