LATIN DICTIONARYLexicon Latīnum
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“pin” in Latin

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

pin v.
figere, infigere aliquid; affigere aliquid ad aliquem rem.
pin s.
acus (general term for needle, for fastening clothes or the hair): to run a pin through anything, transuere acu; trajectare acu; acum transmittere per: ☞ The ancients were not acquainted with our pins, but used a fibula for fastening things together: fibula (anything for joining, fastening, stitching, or clasping things together): clavus (a peg).

Quick answer

What is the Latin word for pin?
The usual Latin words for “pin” are fīgō, acus, fībula; also clāvus. 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.