Hermaphrodism refered to having two or more sexual characteristics or biological functions combined. Unlike the androgynous, hermaphrodites had the capability of being male or female during a sexual process, or undergoing a functional transformation from one gender to another.
The Tholians were a hermaphroditic species, in which individuals have both male and female characteristics. (ENT: "In a Mirror, Darkly")
Some of the actors who played other Xindi Council members decided that Dolim was hermaphroditic. (Star Trek: Communicator issue 151, p. 52)
In the Star Trek: New Frontier novel series, the Hermat species is described as also having this type of sexual makeup.