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BI- = TWO

bicolor

having two different colors

bicuspid

a two-pointed tooth

bicycle

a vehicle with two wheels

biennial

happening every two years

bifocals

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

bilingual

able to speak two different languages

bimonthly

happening everyt two months

biped

a two-footed creature

biplane

an airplane with two pairs of wings

biweekly

happening every two weeks

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