/ ˈsɒdəmi; NAmE ˈsɑːd-/ noun
[ U ] a sexual act in which a man puts his penis in sb's, especially another man's, anus
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WORD ORIGIN
Middle English : from medieval Latin sodomia , from late Latin peccatum Sodomiticum sin of Sodom (after Gen. 19:5, which implies that the men of Sodom practised homosexual rape) (see Sodom and Gomorrah ).