[ C or U ]双子宫（黄道第3宫）;出生于双子宫时段（即在5月23日至6月21日之间）的人 the third sign of the zodiac, relating to the period from 23 May to 21 June, represented by twins (= two brothers or sisters born together), or a person born during this period
It was interesting to discover that the sales department contained a high proportion of those born under the sign of Gemini.
My mother is a talkative, sociable Gemini.