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vitamin D definition

vitamin D

any of several fat-soluble vitamins that are essential for increased absorption of calcium and phosphorus from the intestinal tract, found in fish-liver oils, milk, egg yolk, etc. or produced by irradiation of provitamins; specif.,: a deficiency of vitamin D tends to cause rickets
  1. vitamin D
  2. vitamin D
  3. vitamin D, CHOH, produced by irradiation of a derivative of ergosterol
  4. vitamin D, CHOH, produced by irradiation of a derivative of sitosterol

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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