DURMAST OAK Meaning of DURMAST OAK in English [ 'də:mα:st ]■ noun another term for sessile oak .OriginC18: durmast perh. orig. an error for dunmast , from dun 1 + mast 2 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004