n. One of several kinds of ring-plovers.n. The ring-necked duck or bastard broadbill, Fuligula rufitorques, having a reddish ring around the black neck in the male.n. In Australia, a jackaroo. The name is given in allusion to the white collar which the new arrival is apt to wear, until home training has been supplanted by bush customs. E. E. Morris, Austral English.