LATIN DICTIONARYLexicon Latīnum
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“chord” in Latin

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

chord
chorda (χορδή), or. in pure Latin, fides (but fides is always used in the plur. = “the strings; “except Cic., Fin., 4, 27, 75, and in poetry): nervus (νιῦρον, chord of animal sinews or gut). To touch the chords, nervos tangere.
Of a (geometrical) are, basis (βάσις).

Quick answer

What is the Latin word for chord?
The usual Latin words for “chord” are chorda, fidēs, nervus; also basis. 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.