The medical ward was the medical facility aboard a Klingon Bird-of-Prey, similar to the Federation's sickbay.
In 2373, the medical ward of the IKS Rotarran was ordered to prepare for casualties after locating the IKS B'Moth. Later during this mission, Jadzia Dax brought Worf to the medical ward, after he had been defeated in personal combat by Martok. (DS9: "Soldiers of the Empire")
In 2374, Worf ordered both Alexander Rozhenko and Ch'Targh to report to the medical ward of the Rotarran, after the two had fought each other. (DS9: "Sons and Daughters")