Word-A-Week in Indo-European
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Today's Word: *dhwer-, *dhwor-
Translation:  a doorway, a door
Related to: Greek qura (a door) - feminine a-stem noun
  Latin foris (a door), foras (out the house) - the initial f- proves it used to be *dh-, not *d-
  Common Celtic *dwor- (a door) > Insular Celtic *doressuh - a suffix -est- was added; 
> Welsh Breton dor, Old Irish dorus, Irish Gaelic doras, Scottish Gaelic dorus or dorust (dialect), Old Cornish dor, Cornish daras.
  Common Germanic *dur- (a doorway) with a semi-vowel replacing a root vowel; 
> Gothic dauro (gate), Old English duru (a door), Old High German turi, Old Norse dyrr
  Hittite - not found
  Sanskrit dva'r (a door, gate)
Thracian dur, dero- (a fence) 
> Albanian dere" (a gate)
  Old Baltic *duaris (gate) > Lithuanian durys (plural for "doors"), Latvian duris, Old Prussian dwaris (gate), Sudovian *dvaris (gate)
  Common Slavic *dueris (gate) > Slovene duri (plural - doors), Chekh dveri, Polish drzwi, Upper Sorbian durje, Lower Sorbian z'urja (doors), Ukrainian dveri, Russian dverj (a door), Belorussian dzwery (doors)
Notes: The noun was feminine and i-stem, though later in some groups (Indic, Greek) it migrated into a-stems. 
Some scientists think (and we share) that the plural form is so frequent because of the meaning "doors": two halfs of the gate. It had dual number, and such a fact is still shown in Russian where the word for "gate" is vorota, the former dual form. 
English has its door from Middle English dore form; also some anglicized Latin words exist such as forum, foreign
German has Tor, a neuter noun for "gate", and Tu"r, a feminine for "door". 
Dutch shows deur, Frisian daor, Danish Swedish Norwegian do"r
French inherited a strange word from Latin represented in the set expression au fur et a` mesure (gradually). Other Romance language keep words like fuera in Spanish and fora in Galician both meaning "out, outside, out the door"
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