steroid

Etymology

sterol + -oid

noun

  1. (biochemistry, organic chemistry) A class of organic compounds having a structure of 17 carbon atoms arranged in four rings; they are lipids, and occur naturally as sterols, bile acids, adrenal and sex hormones, and some vitamins; many drugs are synthetic steroids.
  2. (bodybuilding, sports) Any anabolic hormone used to promote muscle growth or athletic performance.

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