Bicentennial
A 200th anniversary.
Bicameral
Composed of two legislative chambers or branches.
Bicuspid
A tooth having two points.
Bigamy
Marrying one person while legally married to another.
Bilateral
Having or involving two sides; binding on both parties (in contrast to unilateral, in which only one party has an obligation).
Bilingual
Able to use two languages
Bipartisan
Consisting of or supported by two parties, especially two major political parties
Biped
A two-footed animal
Biscuit
Twice cooked or baked; today a quick bread baked in small pieces
Bisect
To cut in two, as a diameter bisects a circle.
Bivalve
A mollusk having two valves or shells hinged together, as a mussel or clam