The humanoid people of Draylax, a world close to Earth and a regular stop for human freighters in the 22nd century, whose women were reputed to have three breasts.
The Draylaxians are the native species of Draylax, one of the first alien worlds with which Earth had regular contact. Early cargo ships made the Draylax run long before the launch of Enterprise NX-01, and the planet is mentioned several times in Enterprise, including in Fortunate Son.
No Draylaxian is clearly identified on screen. They are best known from a piece of crew gossip in the pilot, Broken Bow, where it is said that Draylaxian women have three breasts.
The planet keeps turning up as a reference point in later Star Trek, which treats Draylax as a close neighbour and trading partner of Earth in the years before the founding of the Federation.