[Gem.i.ni] n pl but sing in constr [L (gen. Geminorum), lit., the twins (Castor and Pollux)] 1: the 3d zodiacal constellation pictorially represented as the twins Castor and Pollux sitting together and located on the opposite side of the Milky Way from Taurus and Orion
2. a: the 3d sign of the zodiac in astrology b: one born under the sign of Gemini