Having the form or shape of twins or paired things; shaped like something doubled or occurring in pairs.
From Latin 'gemini' (twins) + '-form' (form, shape). The prefix comes from the Roman twins Castor and Pollux, and was generalized to mean 'paired' or 'doubled' in scientific terminology during the 19th century.
This word bridges astronomy and biology—the constellation Gemini literally means 'the Twins' in Latin, and scientists borrowed that exact concept to describe anything that comes in matching pairs, from crystal formations to animal body parts.
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