Easton's Bible Dictionary (1897)
), a small island, one of the Sporades in the Aegean Sea, in the north-west of Rhodes, off the coast of Caria. Paul on his return from his third missionary journey, passed the night here after sailing from Miletus (Acts 21:1). It is now called Stanchio.
Smith's Bible Dictionary (1863)
(Acts 21:1) [Cos, Or Coos]
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
CO'OS, OR COS, a small island north-west of Rhodes, Acts 21:1, in the AEgean Sea; now called Stanchio.
Hitchcock's Bible Names (1869)
top, summit