- In the composition of chemical names bi- denotes two atoms, parts or equivalents of that constituent to the name of which it is prefixed, to one of the other component or that such constituent is present in double the ordinary proportion; as, bichromate, bisulphide. Be- and di- are often used interchangeably.
- In most branches of science bi- in composition denotes two, twice or doubly; as, bidentate, two-toothed; biternate, doubly ternate, etc.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). bi-. Retrieved September 20, 2026, from http://smartdefine.org/bi-/definitions/1980014 |
| Chicago | Webster's. 2011. "bi-" http://smartdefine.org/bi-/definitions/1980014 (accessed September 20, 2026). |
| Harvard | Webster's 2011, bi-, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/bi-/definitions/1980014>. |
| MLA | Webster's. "bi-" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/bi-/definitions/1980014> |