Relating to or affecting the abdomen; anatomical term describing structures or muscles of the abdominal region.
From Latin 'abdominales', the plural form of 'abdominalis' (of the belly), derived from 'abdomen' (belly) with the Latin adjective suffix '-alis'.
This is a genuinely scholarly Latin form you'd find in anatomical texts written in the 18th or 19th centuries when Latin was still used for scientific descriptions—modern English just says 'abdominal' instead.
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