|consonant stemDeclension of *durz (consonant stem)|
This word was a plurale tantum in Old Norse, and it might have been used in that way in Proto-Germanic as well (compare the same development with cognate *dv?ri in most Slavic languages); this is further evident by its form in compound words (e.g. compare Old English ?agduru, Old High German ougatora, ougtora, Gothic (augadaur?)). In Old High German and Old Dutch it became a singular i-stem, which no doubt derives from the original plural. Old English and Old Saxon show a u-stem noun, which most likely derives from the singular because of the lack of umlaut.