biflagellate definitions WordNet (r) 3.0 (2005) adj 1: having two flagella; "a biflagellate zoospore" Merriam Webster's adjective Date: 1856 having two flagella < biflagellate gametes > Webster's 1913 Dictionary Biflagellate Bi`fla*gel"late, a. [Pref. bi- + flagellate.] Having two ...