LATIN DICTIONARYLexicon Latīnum
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“grin” in Latin

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

grin v.
ringi (Vid: Ruhnken, Ter., Phorm., 2, 2, 27), or restringere dentes (Plaut., Capt., 3, 1, 26): ridentem ringi (with laughter; Pomponius, ap. Non.).
grin s.
rictus. A grin of suppressed laughter, rictus quasi refrenato risu (Varr., ap. Non., 456, 9). Vid: To GRIN.

Quick answer

What is the Latin word for grin?
The usual Latin words for “grin” are ringor, Pompōnius, rictus. 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.