Orvor was a male Groxxin.
In 2372, Orvor and his mate Zheronn accidentally discovered details of a retrovirus created by the Dominion that would rewrite the Jem'Hadar's genetic code, thus removing their violent tendencies and their need for ketracel-white. Orvor saw that this would break the Founders' control over the Jem'Hadar and the Jem'Hadar would return to the way the species was before the Founders subjugated them. Orvor was detained by the Dominion soon after his discovery, but Zheronn was able to escape to the Alpha Quadrant and alert the Federation of Orvor's discovery. Starfleet later sent Kira Nerys, Worf and Odo to the Gamma Quadrant, to attempt to rescue Orvor. Orvor was successfully rescued and reunited with his wife, but the Dominion retrieved their files on the retrovirus. (DS9 novel: The Heart of the Warrior)