Cos (Kŏs) or Coos (Kô-os). A small island in the Ægean sea off the coast of Caria, the birthplace of Hippocrates, with a chief town of the same name, in which was a famous temple of Æsculapius. The island was celebrated for its wines, beautiful stuffs, and ointments. Paul passed a night here on his voyage from Miletus to Judea. Acts 21:1.