vitamin K
noun
1
: either of two naturally occurring fat-soluble vitamins essential for the clotting of blood because of their role in the production of clotting factors in the liver:
a
or vitamin K1
: the vitamin C31H46O2 that is produced by plants and obtained especially from green leafy vegetables (such as collards and kale)
b
or vitamin K2
: the vitamin C41H56O2 that is produced by bacteria (as in the intestines of animals) and obtained especially from meat and fermented foods
2
a
or vitamin K3
: menadione
b
: any of several synthetic compounds chemically related to menadione
Examples of vitamin K in a Sentence
Recent Examples on the Web
While vitamin K deficiency is uncommon, people with malabsorptive disorders or those who have had bariatric surgery may need a supplement to meet their needs.
—
Sarah Anzlovar, Ms, Rd, Verywell Health, 18 June 2024
Many cruciferous veggies also contain vitamin K and the dark green ones contain vitamins A and C, according to the Academy of Nutrition and Dietetics.
—Clare Mulroy, USA TODAY, 5 May 2024
Experts advise men and women to consume 120 mcg or 90 mcg, respectively, of vitamin K per day.
—Maggie O'Neill, Health, 13 Apr. 2024
Research on both vitamins suggests that taking vitamin D and vitamin K together can optimize your body’s ability to metabolize calcium.
—Discover Magazine, 29 Feb. 2024
See all Example Sentences for vitamin K 
Sarah Anzlovar, Ms, Rd, Verywell Health, 18 June 2024
Many cruciferous veggies also contain vitamin K and the dark green ones contain vitamins A and C, according to the Academy of Nutrition and Dietetics.
—Clare Mulroy, USA TODAY, 5 May 2024
Experts advise men and women to consume 120 mcg or 90 mcg, respectively, of vitamin K per day.
—Maggie O'Neill, Health, 13 Apr. 2024
Research on both vitamins suggests that taking vitamin D and vitamin K together can optimize your body’s ability to metabolize calcium.
—Discover Magazine, 29 Feb. 2024
See all Example Sentences for vitamin K
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'vitamin K.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Vitamin K.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20K. Accessed 4 Jul. 2024.
Copy CitationMedical Definition
vitamin K
noun1
: either of two naturally occurring fat-soluble naphthoquinone vitamins essential for the clotting of blood because of their role in the production of clotting factors in the liver:
a
or vitamin K1
: a yellow oily vitamin C31H46O2 that is produced by plants and obtained especially from green leafy vegetables (such as collards and kale) and is often used to treat hypoprothrombinemia
called also phylloquinone, phytonadione
b
or vitamin K2
: a pale yellow crystalline vitamin C41H56O2 that is produced by bacteria (as in the intestines of animals) and obtained especially from meat and fermented foods and that typically has greater bioavailability than vitamin K1
called also menaquinone
2
a
or vitamin K3
: menadione
b
: any of several synthetic compounds chemically related to menadione
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