Definition of trichomoniasis
: infection with or disease caused by trichomonads: such as
a : a human sexually transmitted disease occurring especially as vaginitis with a persistent discharge and caused by a trichomonad (Trichomonas vaginalis) that may also invade the male urethra and bladder
b : a venereal disease of domestic cattle marked by abortion and sterility
c : one or more diseases of various birds resembling blackhead
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