The V'radians were a humanoid species from inside the Delphic Expanse.
B'Rat Ud was a V'radian. (ENT: "Rajiin")
A V'radian was also held captive in the slave market on Verex III. (ENT: "Borderland")
In the final draft script of "Rajiin", the V'radians were described as having "sharp features and alabaster white skin."