menadione
[men-uh-dahy-ohn]
- a synthetic yellow crystalline powder, C11H8O2, insoluble in water, used as a vitamin K supplement.
Show More
Origin of menadione
Also called vitamin K3.
vitamin K1
- a yellowish, oily, viscous liquid, C31H46O2, 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.
Show More
Origin of vitamin K1
First recorded in 1930–35
Also called phylloquinone, phytonadione.
vitamin K2
- a light-yellow, crystalline solid, C41H56O2, having properties similar to those of vitamin K1.
Show More
vitamin K3
Show More
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
vitamin K
- any of the fat-soluble vitamins, including phylloquinone and the menaquinones, which are essential for the normal clotting of blood
Show More
vitamin K1
- another name for phylloquinone
Show More
vitamin K2
- another name for menaquinone
Show More
vitamin K3
- a former name for menadione
Show More
menadione
- a yellow crystalline compound used in fungicides and as an additive to animal feeds. Formula: C 11 H 8 O 2Also: vitamin K 3
Show More
Word Origin
C20: from me (thyl) + na (phtha) + di- 1 + -one
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
vitamin K
- 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.antihemorrhagic factor
Show More
menadione
(mĕn′ə-dī′ōn′)- A synthetic vitamin K derivative occurring as a yellow crystalline powder and used as a vitamin K supplement.
Show More
vitamin K1
- A yellow viscous oil found in leafy green vegetables or made synthetically, used by the body to form prothrombin.
Show More
vitamin K2
- Any of various yellowish crystalline compounds isolated from putrefied fish meal or from various intestinal bacteria and used to stop hemorrhaging.menaquinone
Show More
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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.
Show More
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.
Show More
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.
Show More
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.