(1):

(n.) A girdle; particularly that of Aphrodite (or Venus) which gave the wearer the power of exciting love.

(2):

(n.) A covering for the hands of boxers, made of leather bands, and often loaded with lead or iron.

(3):

(n.) A genus of Ctenophora. The typical species (Cestus Veneris) is remarkable for its brilliant iridescent colors, and its long, girdlelike form.