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“ante-chamber” in Latin

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

ante-chamber
amphithalamus (ἀμφιθάλαμος, Vitr., 6, 7 [10], 2ed., Schneid.: others read autithalamus): procoeton (an ante-room to a bed-chamber where slaves used to wait: προκοιτών in Varr., R.R.): vestibulum (open space before a Roman house, where those who had business there waited: in vestibulo aedium opperiri salutationem Caesaris). To be on guard in the emperor’s ante-chamber, excubias circa cubiculum principis agere (Suet.).

Quick answer

What is the Latin word for ante-chamber?
The usual Latin words for “ante-chamber” are prŏcoeton, vestibulum. 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.