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“door” in Latin

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

door
ostium (any opening for an entrance, especially in the interior of a house; ☞ the ancients usually hung only curtains, vela, before the entrances of the several apartments of a house; more rarely they employed folding-doors, fores): janua (a house-door): foris, usually plurial, fores (as the doors mostly consisted of two leaves): valvae (plurial, double doors, i. e., folding back like a window- shutter): a back-door, ostium posticum, posticum only (general term); pseudothyrum (a secret back-door, Cic., post Red. in Sen., 6, 14): a front-door, janua: bed-room door, fores cubiculi: to be let in by the back-door, pseudothyro recipi (opposed to janua intromitti, Cic.): to open a door to anything (figuratively), fenestram ad aliquid patefacere (e.g., ad nequitiam alicui, Terentianus); januam or (Cic.) aditum januamque patefacere (e.g., to glory, famae, Plin., Ep., 1, 18): to enter anything by any door, aliqua janua ingredi in aliquid (Cic.; figuratively): from door to door, ostiatim: to open a door, ostium, januam, or fores patefacere, aperire (general terms): fores reserare (to unbolt): fores recludere (to unlock): to shut a door, ostium, januam, fores operire (general terms): ostii pessulum obdere (to bar); fores obserare (to bolt): fores claudere or occludere (to close the leaves): to knock at a door, januam, ostium, or fores, pulsare: to break open a door, fores effringere; frangere januam (Hor.): to attend at the door, ostium observare: to let in at a door, aliquem janua intromittere: to drive from one’s doors, aliquem januae aditu arcere; aliquem janua prohibere; aliquem excludere: to show anybody the door, jubere aliquem abire or discedere: to be at the door (figuratively), imminere or impendere: subesse (e.g., fames impendet; mors imminet; hiems suberat): to turn anybody away from one’s doors, aliquem limine submovere; repellere foribus (to drive away with violence): prohibere janua; excludere aliquem (not to suffer him to come into the house). To turn (a son) out of doors, abdicare filium.
To lay anything at anybody’s door, aliquid alicui acceptum referre; aliquid alicui assignare (Liv.); culpam alicui attribuere, assignare; culpam conferre, conjicere, vertere in aliquem: the fault does not lie at my door, a me haec culpa procul est: some blame, however, lies at your door, tua tamen nonnulla culpa est: the blame lies at my door, ego sum in culpa; in me est culpa; mea est culpa: all the blame lies at your door, tua summa culpa est.

Quick answer

What is the Latin word for door?
The usual Latin words for “door” are ōstium, iānua, forum; also sum, valva, postīcus. 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.