Dominican \Do*min"i*can\, a. [NL. Dominicanus, fr. Dominicus, Dominic, the founder: cf. F. Dominicain.] Of or pertaining to St. Dominic (Dominic de Guzman), or to the religions communities named from him. {Dominican nuns}, an order of nuns founded by St. Dominic, and chiefly employed in teaching. {Dominican tertiaries} (the third order of St. Dominic). See {Tertiary}.