Real Dictionary

tampon
countable noun: A tampon is a tube made of cotton wool that a woman puts inside her vagina in order to absorb blood during menstruation.

tampon in American English
a plug of cotton or other absorbent material put into a body cavity, wound, etc. to stop bleeding or absorb secretions; esp., such a plug for absorbing the menses
to put a tampon into
noun: a plug of cotton or the like for insertion into an orifice, wound, etc., chiefly for absorbing blood or stopping hemorrhages
transitive verb: to fill or plug with a tampon

tampon in British English
noun: a plug of lint, cotton wool, cotton, etc, inserted into an open wound or body cavity to stop the flow of blood, absorb secretions, etc, esp one inserted into the vagina to absorb menstrual blood
verb: to plug (a wound, etc) with a tampon