brier1 Syllabification: (bri·er)Pronunciation: /ˈbrī(ə)r/ (also briar)Definition of brier noun any of a number of prickly scrambling shrubs, especially the sweetbrier and other wild roses. Derivatives briery adjective Origin: Old English brǣr, brēr, of unknown originbrier in other Oxford dictionaries Definition of brier in the British & World English dictionary