Bilateral -eriter: with two equal or symmetrical sides.
Biliary vessels: see malpighian tubules.
Bilineate -us: with two lines.
Bilobate -ed: divided into two lobes.
Binocular: having two cells or compartments: see biareolate.
Bimaculate: with two spots or maculae.
Binate: in pairs: consisting of a single pair.
Binotate: with two rounded spots.
Binus: paired: doubled.
Biogenesis: the production of life from antecedent life.