bicolor

having two different colors

bicuspid

a two-pointed tooth located in the side of the jaw

bicycle

a vehicle with two wheels

biennial

happening every two years

bifocals

eyeglasses with lenses that have two different sections- for seeing up close and far away

bilingual

able to speak two different languages

bimonthly

happening every two months

biped

a two-footed creature

biplane

an airplane with two pairs of wings

biweekly

happening every two weeks