M.E. merger of O.E. dor
(neut.; pl. doru
) "large door, gate," and O.E. duru
(fem., pl. dura
"door, gate, wicket"), both from P.Gmc. *dur-,
from PIE *dhwer-/*dhwor-
"a doorway, a door, a gate" (cf. Gk. thura,
"mouth," Goth. dauro
"gate," Skt. dvárah
"door, gate," O.Pers. duvara-
"door," O.Prus. dwaris
"gate," Rus. dver'
"a door"). 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. M.E. had both dure
predominated by 16c., but was supplanted by door.
"A door is what a dog is perpetually on the wrong side of." [Ogden Nash]
First record of dooryard
is c.1764, Amer.Eng.; doorstep
is from 1810.