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spammer - 2 dictionary results
spam   (spām)   
n.  Unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups; junk e-mail.
tr.v.   spammed, spam·ming, spams
  1. To send unsolicited e-mail to.
  2. To send (a message) indiscriminately to multiple mailing lists, individuals, or newsgroups.

[From Spam (probably inspired by a comedy routine on the British television series Monty Python's Flying Circus, in which the word is repeated incessantly).]
spam'mer n.
Main Entry:  spammer
Part of Speech:  n
Definition:  a person who sends unwanted or inappropriate electronic mail to multiple recipients, often advertisements
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