What is the Latin word for twin?

The usual Latin words for “twin” are geminus, ēnītor. The right choice depends on the sense; see the distinctions below.

English → Latin

“twin” in Latin

geminustwinborn, twin; double, paired, two, twofold, both, half-and-half; resembling, similar, like ēnītorto bear, give birth; to strive, struggle; to climb, ascend

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

twin

geminus (☞ vopiscus = a twin born after the premature birth or the death of the other; Vid: Plin., 7, 10, 8). Twins, gemini; fratres gemini (general term); gemini pueri (if both are boys): to have twins, geminos parere or eniti; uno partu duos parere simul; geminam stirpem edere: to have two twin boys, duos virilis sexus simul eniti: a twin brother, sister, frater geminus, soror gemina.

The twins (a constellation), Gemini; astrum geminum.

Quick answer

What is the Latin word for twin?: The usual Latin words for “twin” are geminus, ēnītor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.