DOATER Meaning of DOATER in English doater 1 /doh"teuhr/ , n.doter.doater 2 /doh"teuhr/ , n. Newfoundland.a fully mature harp seal. Also, dotard . [ 1785-95; appar. special use of DOTARD ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012