LATIN DICTIONARYLexicon Latīnum
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“circumflex” in Latin

The English word circumflex itself goes back to Latin circumflexus.

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

circumflex
circumflexus accentus (Diomedes, 425; P., and other grammarians): apex = the mark of a long syllable placed over the vowels (Vid: Spald., Quint., 1, 5, 23): to place the circumflex over a syllable, syllabam circumducere (Quint., 3. 172, and 12, 10, 33), or circumflectere (Gell., 4, 7, 2); syllabam apice circumducere (if it it contracted from two vowels, Quint., I, 5, 23; compare Ritter, Gramm. Lat., p. 87, note): a syllable which has the circumflex, syllaba circumflexa.

Quick answer

What is the Latin word for circumflex?
The usual Latin words for “circumflex” are apex, Dĭŏmēdes, circumflectō. 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.