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“horse-laugh” in Latin

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

horse-laugh
cachinnus: cachinnatio (as act): mirus risus (portentous or astounding laughter, Cic.). To burst into a horse-laugh, cachinnum tollere (Cic.), edere (Suet.); in cachinnos subito effundi (Suet.); cachinno concuti (to shake one’s sides with laughter, with majore, Juv.; hence magno, maximo, etc.); mirum risum (miros risus, of several) edere (Cic., Qu., Fr., 2, 10, 2): to burst out again into a horse-laugh, cachinnos revocare (Suet., Claud., 41).

Quick answer

What is the Latin word for horse-laugh?
The usual Latin words for “horse-laugh” are cachinnus, cachinnātiō, edō; also maximus. 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.