Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A progestational hormone, C20H26O2, similar in effect to progesterone, used especially in oral contraceptives.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis

Etymologies

nor- + alteration of ethyn(e) + (an)dr(ostene), a steroid + -one.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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