Gemini

[jem-uh-nahy, -nee]
plural noun, genitive Gem·i·no·rum [jem-uh-nawr-uh m, -nohr-] /ˌdʒɛm əˈnɔr əm, -ˈnoʊr-/ for 1.
  1. Astronomy. the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux.
  2. Astrology.
    1. the third sign of the zodiac: the mutable air sign.
    2. 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.

Origin of Gemini

1350–1400; Middle English < Latin geminī, plural of geminus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for gemini

Gemini

noun Latin genitive Geminorum (ˌdʒɛmɪˈnɔːrəm)
  1. astronomy a zodiacal constellation in the N hemisphere lying between Taurus and Cancer on the ecliptic and containing the stars Castor and Pollux
  2. classical myth another name for Castor and Pollux
  3. astronautics any of a series of manned US spacecraft launched between the Mercury and Apollo projects to improve orbital rendezvous and docking techniques
  4. astrology
    1. Also called: the Twinsthe third sign of the zodiac, symbol ♊, having a mutable air classification and ruled by the planet Mercury. The sun is in this sign between about May 21 and June 20
    2. a person born when the sun is in this sign
adjective
  1. astrology born under or characteristic of Gemini
Also (for senses 4b, 5): Geminian (ˌdʒɛmɪˈnaɪən)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for gemini

Gemini

constellation, late Old English, from Latin gemini (plural of adjective geminus) "twins" (see geminate). The twins are Castor and Pollux. Meaning "a person born under the sign of Gemini" is recorded from 1894. As an oath, from 1660s (also found in Dutch and German), perhaps a corruption of Jesu (cf. jiminy).

Online Etymology Dictionary, © 2010 Douglas Harper

gemini in Science

Gemini

[jĕmə-nī′]
  1. A constellation in the Northern Hemisphere near Cancer and Auriga. Gemini (the Twins) contains the bright stars Pollux and Castor and is the third sign of the zodiac.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.