Dictionary Definition:
dur 1 dúr f. (only dúras acc. nom., and durás. pl.) = dvār, a door (cf. 2. dura)
dur 2 dur in comp. for dus (p.488), denoting 'bad' or 'difficult' &c • duriṣṭha, (superl.) very bad or difficult or wicked • n. great crime or wickedness L.