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“nail” in Latin

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

nail s.
On the finger or toes, unguis. Long nails, ungues eminentes (Ov., A.A., 1, 519; et nihil emineant ungues, i. e., one ought not to have long nails): dirty nails, ungues sordidi (loc. cit., et sint sine sordibus ungues): to pare the nails, ungues recidere, or resecare, or subsecare: to bite the nails, ungues rodere (Hor., Sat., 1, 10, 71): to move not a nail’s breadth, aliquo loco non unguem latum excedere: to swerve not a nail’s breadth from anything, transversum unguem ab aliqua re non recedere.
A small spike or stud, clavus. A large nail for fastening beams, clavus trabalis: shoe nails, clavi caligares: to drive a nail, clavum figere or defigere in aliqua re; clavum adigere in aliquid: you have hit the right nail on the head, rem acu tetigisti (Plaut., Rud., 5, 2, 19): to be a nail in one’s coffin, causam mortis esse.
A measure of length, *digiti duo cum quadrante.
nail v.
clavis affigere aliquid: clavis firmare or munire aliquid; to anything, alicui rei or ad aliquid; clavis configere aliquid aliqua re (to fasten anything with nails).

Quick answer

What is the Latin word for nail?
The usual Latin words for “nail” are clāvus, resecō. 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.