Only once in Authorized Version (Acts 19:12). The Greek word (sudarion) so rendered means properly "a sweat-cloth." It is rendered "napkin" in John 11:44; 20:7; Luke 19:20.

Noah Webster's New International Dictionary of the English Language

1. (n.) A piece of cloth, usually square and often fine and elegant, carried for wiping the face or hands.

2. (n.) A piece of cloth shaped like a handkerchief to be worn about the neck; a neckerchief; a neckcloth.