| A | B |
|---|
| bicolor (adj) | Having two different colors |
| bicuspid (n) | A two-pointed tooth in the side of the jaw. |
| bicycle (n) | A vehicle with two wheels |
| biennial (adj) | Happening every two years |
| bifocals (n) | Eyeglasses with two-section lenses |
| bilingual (adj) | Able to speak two different languages |
| bimonthly (adj) | Happening every two months |
| biped (n) | A two-footed creature |
| biplane (n) | An airplane with two pairs of wings |
| biweekly (adj) | Happening every two weeks. |
| unicellular (adj) | Having only one cell |
| unicorn (n) | A horse-like mythical creature with one horn. |
| unicycle (n) | A one-wheeled vehicle pedaled by a rider |
| unidirectional (adj) | Moving in only one direction |
| unify (v) | To join together into one group |
| unilateral (adj) | One sided |
| unique (adj) | One of a kind; unusual; rare |
| unison (n) | All together. A group that sounds as if it were one person |
| unit (n) | One group, part, or thing |
| unitard (n) | A one-piece leotard and tights combination |
