Dareel was a Trill physician in the 23rd century. Dareel was the doctor in residence at the Trill Embassy in Nagano, Japan on Earth, and performed the operation separating the Dax symbiont from its dying host, Torias, in 2284. (DS9 - The Lives of Dax short story: "Infinity")

The story leaves both Dareel's gender and joining status unclear.