LATIN DICTIONARYLexicon Latīnum
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“lock” in Latin

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

lock
An instrument for fastening, claustrum. ☞ The ancients used a bolt or bar in the place of our lock and key; in some cases they had a contrivance, by means of a thong with a loop or hook, for removing the bolt from the outside of a door; sometimes, also, they employed a seal; e.g., Plaut., Cas., 2, 1, 1, obsignate cellas, referte annulum ad me; as if one should say, lock them up and bring the key to me. To put under lock and key, sub signo et claustris ponere.
A wear; dam, objectaculum (Varr.).
A tuft of hair, cirrus (natural): cincinnus (artificial): annulus (ringlet).
Part of a gun, *igniarium.
lock v.
To fasten with a lock, claustrum objicere alicui rei: to lock up, claudere; concludere. ☞ The ancients sometimes employed a seal instead of a lock and key; hence the classical phrases, signare: obsignare: annulo vindicare: to lock up in anything, concludere, includere (to shut in) in re: to lock one’s self up in Ike house, se includere domi: to lock anyone up (in prison), aliquem in custodiam includere.
To trig (a wheel), (rotam) sufflamipare (Sen.).

Quick answer

What is the Latin word for lock?
The usual Latin words for “lock” are objectācŭlum, cirrus, cincinnus; also ānulus, igniārius, claudō. 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.