Renhol was a Trill female and a Commissioner and Doctor in the Trill Symbiosis Commission in the 24th century. She and Jadzia Dax met in the 2360s when Jadzia was joined with Dax. She was joined to a symbiont.
In 2371, Renhol treated Jadzia when the memory block of Dax's joining to Joran Dax began to break down. Renhol hoped to keep the secret that half of all Trill were suitable to be joined secret, even if it meant Jadzia's death. Renhol relented and let the Guardian Timor remove the mental block, giving Jadzia all of Joran's memories. (DS9 episode: "Equilibrium")
After Ezri was joined with Dax, Renhol had her contact her every week or at least once a month. In 2376, she contacted Ezri on Deep Space 9. Renhol expressed concern that Ezri was using memories from a variety of past Dax hosts to help her in new position in command. (DS9 novel: Demons of Air and Darkness)
Several months later, Renhol was killed during the disturbances caused by the Neo-Purists on Trill. At the time of her death, it was believed she was about to run for the Presidency. (DS9 novel: Trill: Unjoined)