LATIN DICTIONARYLexicon Latīnum
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“vestibule” in Latin

The English word vestibule itself goes back to Latin vestis, through vestibulum.

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

vestibule
vestibulum (open space before a Roman house, where those who had business there waited; in vestibulo aedium opperiri salutationem Caesaris): procoeton (an ante-room to a bed-chamber, where slaves used to wait; προκοιτών, in Varr., R.R.).

Quick answer

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