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“back-door” in Latin

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

back-door
postica (scilicet, janua); ostium posticum, also merely posticum: Janua aversa or interior [with the same distinction as in BACK-GATE].

Quick answer

What is the Latin word for back-door?
The usual Latin words for “back-door” are postīcus, interior, scīlicet; also iānua. 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.