a. (and sb.) [f. BI- pref.2 1 + VALVULAR.] = BIVALVE: a. in Zool.; also quasi-sb.; b. in Bot.

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  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.

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  b.  1830.  Lindley, Nat. Syst. Bot., 294. Those species of Panicum that have the lower flower neuter and bivalvular.

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