LATIN DICTIONARYLexicon Latīnum
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“ass” in Latin

The English word ass itself goes back to Latin asinus.

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

ass
asinus. Little ass, asellus. Young ass, colt of an ass, pullus asininus. The ass brays, asinus rudit. A wild ass, onager.
As a word of contempt (= fool, dolt) the Romans used asinus only of a simple, sillyperson, [In me quidvis harum rerum convenit Quae sunt dictae in stultum, caudex stipes, asinus, plumbeus, Ter.]: stipes: truncus: aeque hebes ac pecus, (Cic.). Ass’s skin, pellis asinina: milk, lac asininum.

Quick answer

What is the Latin word for ass?
The usual Latin words for “ass” are asinus, stīpō, truncus; also asellus, onager. 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.