n.
Pronunciation: ˌ k ō -l ə -( ˌ )kal- ' si-f ə - ˌ ro ̇ l, - ˌ r ō l
Function: noun
Etymology: International Scientific Vocabulary
Date: 1955
: a sterol C 27 H 43 OH that is a natural form of vitamin D found especially in fish, egg yolks, and fish-liver oils and is formed in the skin on exposure to sunlight or ultraviolet rays ― called also vitamin D 3