vitamin D

(redirected from 1,25-dihydroxyvitamin D)
Also found in: Thesaurus, Medical, Encyclopedia.

vitamin D

n.
A fat-soluble vitamin occurring in several forms, especially vitamin D2 or vitamin D3, that is required for normal growth of teeth and bones and is involved in many other metabolic processes, produced in the skin upon exposure to sunlight and present in fish, eggs, and fortified foods such as milk.

vitamin D2

n.
A white crystalline compound, C28H44O, produced commercially by ultraviolet irradiation of ergosterol obtained from fungi or plants, and used as a dietary supplement. Also called ergocalciferol.

vitamin D3

n.
A colorless crystalline compound, C27H44O, found in fish, eggs, and fortified foods and formed in the skin of humans and other vertebrates upon exposure to ultraviolet radiation, as in sunlight. It is often used as a dietary supplement. Also called cholecalciferol.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

vitamin D

n, pl D vitamins
(Biochemistry) any of the fat-soluble vitamins, including calciferol and cholecalciferol, occurring in fish-liver oils (esp cod-liver oil), milk, butter, and eggs: used in the treatment of rickets and osteomalacia
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

vitamin D


n.
any of the several fat-soluble, antirachitic vitamins D1, D2, D3, occurring in milk and fish-liver oils, esp. cod and halibut: essential for the formation of normal bones and teeth.
[1920–25]

vitamin D1


n.
a form of vitamin D obtained by ultraviolet irradiation of ergosterol.
[1930–35]

vitamin D2


n.
[1930–35]

vitamin D3


n.
a form of vitamin D, C27H43OH, occurring in fish-liver oils, that differs from vitamin D2 by slight structural differences in the molecule. Also called cholecalciferol.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

vitamin D

Any of a group of vitamins necessary for normal bone growth. Vitamin D is found in milk, fish, and eggs and can be produced in the skin on exposure to sunlight.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.vitamin D - a fat-soluble vitamin that prevents ricketsvitamin D - a fat-soluble vitamin that prevents rickets
ergosterol - a plant sterol that is converted into vitamin D by ultraviolet radiation
fat-soluble vitamin - any vitamin that is soluble in fats
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Results from Part 1 of this study, reported in 2018, demonstrated a positive impact of Oral PTH on three metabolic parameters - serum calcium, phosphate, and 1,25-dihydroxyvitamin D - in patients with hypoparathyroidism.
Hypercalcemia due to endogenous production of 1.25 dihydroxyvitamin D has been described in Crohn's disease, and it has been postulated that granulomatous lesions secrete 1,25-dihydroxyvitamin D leading to hypercalcemia.
Unfortunately in our case, the original lung biopsy was done long before the patient developed hypercalcemia, and staining the biopsy for 1,25-dihydroxyvitamin D to confirm ectopic production of calcitriol or increased activity of 1 alpha hydroxylase in tumor cells was not possible.
* Don't routinely measure 1,25-dihydroxyvitamin D unless the patient has hypercalcemia or decreased kidney function.
1,25-dihydroxyvitamin D has a short halflife of about 4 hours and 25-hydroxyvitamin D has a long half-life of 2 - 3 weeks.
Adams, "Transpleural gradient of 1,25-dihydroxyvitamin D in tuberculous pleuritis," Journal of Clinical Investigation, vol.
Chief executive Ian Cookson said: "This test is a prime example of our commitment to deliver innovative and effective products and we are proud to be the first diagnostic company to offer tests for both 25 hydroxyvitamin D and 1,25-dihydroxyvitamin D on the same automated system.
In populations with chronic kidney disease, low levels of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D, and high levels of intact parathyroid hormone have been suggested to explain the association between chronic kidney disease and cardiovascular mortality.
Circulating 1,25-dihydroxyvitamin D concentrations among participants with chronic kidney disease did not significantly associate with prevalent or incident CAC in adjusted models.