Etymology
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cortisol (n.)

"hydrocortisone," 1953; see from cortisone + -ol. Chosen as a shorter and clearer alternative to hydrocortisone.

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Definitions of cortisol

cortisol (n.)
an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism;
Synonyms: hydrocortisone / Hydrocortone / Cortef
From wordnet.princeton.edu