/jem"euh nuy', -nee/ , n.pl., gen. Geminorum /jem'euh nawr"euhm, -nohr"-/ for 1.
1. Astron. the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux.
a. the third sign of the zodiac: the mutable air sign. See illus. under zodiac .
b. a person born under this sign, usually between May 21st and June 20th.
3. a two-person U.S. spacecraft designed for orbital rendezvous and docking: used in 1965-66 in various experiments preparatory to a landing on the moon.
[ 1350-1400; ME gemini, pl. of geminus ]