Prefixes:
* Bicentennial: 200th anniversary
* Biceps: muscle with two heads
* Bilingual: able to speak two languages
* Binary: composed of two parts
* Binocular: having two lenses
* Bipartisan: involving two parties
* Bisect: to cut into two equal parts
* Bicycle: a vehicle with two wheels
Other Words:
* Bible: sacred book of Christians, literally meaning "the books"
* Bibliography: list of books or other writings
* Biology: study of living organisms
Note:
While many words with the prefix "bi" are related to the number "two", it is also important to remember that the Greek root "bi" can also have other meanings, such as "life" or "living". For example, the word "bios" means "life" and is the root of words like "biosphere" and "biodiversity".