Meaning of postnasal

post•na•sal

Pronunciation: (pōst'nā'zul), [key]
— adj.
  1. located or occurring behind the nose or in the nasopharynx, as a flow of mucus; nasopharyngeal: a postnasal infection.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.