Etymology
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Words related to Door

*dhwer- 

Proto-Indo-European root meaning "door, doorway." The base form is frequently in dual or plural, leading to speculation that houses of the original Indo-Europeans had doors with two swinging halves.

It forms all or part of: afforest; deforest; door; faubourg; foreclose; foreign; forensic; forest; forfeit; forum; hors d'oeuvre; thyroid.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit duárah "door, gate;" Old Persian duvara- "door;" Lithuanian dùrys (plural); Greek thyra "door;" Latin foris "out-of-doors, outside;" Gaulish doro "mouth;" Old Prussian dwaris "gate;" Russian dver' "a door;" Old English dor, German Tür "door," Gothic dauro "gate."

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backdoor (adj.)
also back-door, "devious, shady, illegal," 1640s. The notion is of business done out of public view. The noun back door in the literal sense is from 1520s, from back (adj.) + door. The association with sodomy is from at least 19c.; compare also back-door man "a married woman's lover," African-American vernacular, early 20c.
door-bell (n.)

also doorbell, "bell at a door, or connected to a knob outside a door, for the purpose of giving notice when someone desires admission," 1800, from door + bell (n.).

door-knob (n.)

also doorknob, "the handle by which a door is opened," 1829, American English, from door + knob.

door-knocker (n.)

"metal device fixed to the outside of a door for banging to give notice when someone desires admission," 1794, from door + knocker (n.).

door-mat (n.)

also doormat, "heavy mat placed before a door for use in cleaning the shoes by those entering," 1660s, from door + mat. Figurative use in reference to persons people "walk all over" or upon whom they (figuratively) clean their boots is by 1861.

doornail (n.)

also door-nail, "large-headed nail used for studding batten doors for strength or ornament," late 14c.; see door (n.) + nail (n.). The figurative expression dead as a doornail is attested as early as the word itself.

But ich haue bote of mi bale bi a schort time, I am ded as dore-nail. ("William of Palerne," c. 1375).

Compare key-cold "lifeless, inanimate, devoid of heat, cold as a metal key" (1510s). Also in Middle English as a symbol of muteness (domb as a dor nail, c. 1400).  

doorstep (n.)

also door-step, "threshold, step up from the ground to a door," 1810, from door + step (n.).

door-stop (n.)

"device placed behind a door to prevent it from being opened too widely," 1859, from door + stop (n.).

door-strip (n.)

"border or weather-guard affixed to the edge of a door, fitting tightly against the casing when it is closed," 1849, from door + strip (n.).