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
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- , CHOH, produced by irradiation of a derivative of ergosterol
- , CHOH, produced by irradiation of a derivative of sitosterol