| BICAMERAL | composed of two legislative chambers or branches / DWUIZBOWY |
| BICENTENNIAL | a 200th anniversary / DWUSETLECIE |
| BICUSPID | a tooth having two points / ZĄB PRZEDTRZONOWY |
| BIGAMY | marrying one person while legally married to another / BIGAMIA |
| BILATERAL | having or involving two sides / DWUSTRONNY |
| BILINGUAL | able to use two languages / DWUJĘZYCZNY |
| BIPARTISAN | consisting of or suppoerted by two parties / DWUPARTYJNY |
| BIPED | a two-footed animal / DWUNOŻNY |
| BISCUIT | twiced-cooked or baked; a quick bread baked in small pieces / HERBATNIK |
| BISECT | to cut in two, as a diameter bisect a circle / DZIELIĆ, PRZEPOŁOWIĆ |
| BIVALVE | a mollusk having two valves or shells hinged together, as a mussel or calm / MAŁŻA |
| *BIANNUAL | *two times a year / 2x W ROKU |
| *BIENNIAL | *occuring every two year / DWUROCZNY, DWULETNI |
| *BIFOCAL | *ex. bifocal glasses / DWUOGNISKOWE |
| *BINOCULARS | *LORNETKA |
| *BIGAMIST | *BIGAMISTA |
| *BINOMIAL | *DWUMIAN/ DWUMIANOWY |
| *BIPARTITE | *DWUSTRONNIE, DWUDZIELNIE, DWUPŁATOWO |
