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sildenafil citrate

[sil-den-uh-fil]
noun Pharmacology.
  1. a white crystalline powder, C22H30N6O4S, that temporarily normalizes erectile function of the penis by blocking an enzyme known to inhibit the production of a chemical that causes erections: used in the form of a pill to treat impotence.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018