Etymology
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steroid (n.)

naturally occuring substance based on a carbon skeleton similar to that of sterol molecules, 1936, from sterol + -oid "resembling." Related: Steroids.

updated on November 27, 2013

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Definitions of steroid from WordNet

steroid (n.)
any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects;
steroid (n.)
any hormone affecting the development and growth of sex organs;
Synonyms: steroid hormone / sex hormone
From wordnet.princeton.edu, not affiliated with etymonline.