a. (and sb.) [f. BI- pref.2 1 + VALVULAR.] = BIVALVE: a. in Zool.; also quasi-sb.; b. in Bot.
a. 1677. Plot, Oxfordsh., 100. The bivalvular Conchæ, such as Cockles, Escallops, Oysters, &c. Ibid., 117. Bivalvulars should always be found with their shells apart.
b. 1830. Lindley, Nat. Syst. Bot., 294. Those species of Panicum that have the lower flower neuter and bivalvular.
