transvestite

plural transvestites

1. datedA person who sometimes wears clothes traditionally worn by and associated with the opposite sex; typically a male who cross-dresses occasionally by habit or personal choice.

   Even though Steven used to dress up in his sister's clothes, it still came as a surprise he ended up as a transvestite.

   1 more example

   Now, we already know that Gerald Hadleigh was a transvestite or a transsexual, whatever the term is.

   1998 March 29, Anthony Horowitz et al., “Written in Blood”, in Midsomer Murders

   Synonyms: cross-dresser, TV, tranny, transy

2. clinical psychologyA person, typically a heterosexual male, who compulsively seeks and derives paraphilic sexual arousal from cross-dressing, especially if the urges and behavior cause the patient distress or social impairment.
3. datedbiologyAn animal that engages in sexual mimicry.

   1 more example

   "Proper" scorpion fly behavior entails the catching of an edible insect by the male, who then offers it to the female […] If she likes the gift, she mates with the male. Thornhill, however, has observed males approaching other males, assuming the female role until they get a grip on the food. Once they have it, they try to run away with it. The "transvestite" males, according to Thornhill, have an advantage over the other males because they have others do the hunting for them, leaving the "transvestites" more time to reproduce. In additon ^([sic]), the "transvestite" scorpion flies would avoid such hazards of the hunt as spider webs.

   1979 August 18, “Get A Grip On The Food”, in Gay Community News, volume 7, number 5, page 2