Common words:
* binary: Relating to a system of two parts or states.
* binocular: Relating to or using both eyes.
* binomial: Consisting of two terms.
* bind: To tie or fasten together.
* binge: To eat, drink, or engage in an activity excessively.
* bio: Short for "biology" or "biological."
Less common words:
* binate: Having two parts.
* binal: Relating to or based on two.
* binational: Involving two nations.
* binuclear: Having two nuclei.
* biped: An animal that walks on two legs.
Note: The prefix "bin" can sometimes be found in compound words that are less common in everyday language.