Source : Webster's Revised Unabridged Dictionary (1913)

Tampon \Tam"pon\, n. [F. See {Tampion}.] (Surg.)
   A plug introduced into a natural or artificial cavity of the
   body in order to arrest hemorrhage, or for the application of
   medicine.

Tampon \Tam"pon\, v. t. (Surg.)
   To plug with a tampon.

Source : WordNet®

tampon
     n : plug of cotton or other absorbent material; inserted into
         wound or body cavity to absorb exuded fluids (especially
         blood)
     v : plug with a tampon