| Word | Definitions | Synonyms |
|---|---|---|
| biped | (noun) an animal with two feet | - |
| bipedalism | (noun) the bodily attribute of being bipedal; having two feet | - |
| biplane | (noun) old fashioned airplane; has two wings one above the other | - |
| biprism | (noun) an optical device for obtaining interference fringes | - |