B / bĭpennis
adjective

bĭpennis

neut. bĭpenne
(), , bispenna
having two wings; two-winged
having two wings, two-winged (very rare): insectum, Plin. 11, 28, 33, § 96 (cf. just before, binis advolat pinnis): plumae, Varr. ap. Non. p. 79, 17.