Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A drug that inhibits phosphodiesterase, C22H19N3O4, used to treat erectile dysfunction by increasing the level of cyclic GMP, which increases blood flow to the erectile tissues.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A PDE5 inhibitor marketed in pill form for treating erectile dysfunction and other conditions.

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

  • noun virility drug (trade name Cialis) used to treat erectile dysfunction in men

Etymologies

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

[tadal-, origin unknown + -afil, phosphodiesterase inhibitor suff. (from sildenafil).]

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