biramose,a.Zool.|baɪˈreɪməʊs| [f. bi-2 + ramose a.] = biramous a. 1877H. Woodward in Encycl.Brit. VI. 652/1 Behind these are six pairs of powerful biramose natatory feet.1888Rolleston & Jackson Anim. Life 539 With a bivalve shell and large natatory biramose second antennæ.