- a synthetic yellow crystalline powder, C11H8O2, insoluble in water, used as a vitamin K supplement.
Origin of menadione
Also called vitamin K3.
- 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.
Origin of vitamin K1
First recorded in 1930–35
- a light-yellow, crystalline solid, C41H56O2, having properties similar to those of vitamin K1.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any of the fat-soluble vitamins, including phylloquinone and the menaquinones, which are essential for the normal clotting of blood
- another name for phylloquinone
- another name for menaquinone
- a former name for 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
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
- 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
- A synthetic vitamin K derivative occurring as a yellow crystalline powder and used as a vitamin K supplement.
- A yellow viscous oil found in leafy green vegetables or made synthetically, used by the body to form prothrombin.
- Any of various yellowish crystalline compounds isolated from putrefied fish meal or from various intestinal bacteria and used to stop hemorrhaging.menaquinone
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.
- 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.
- 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.