Biface is a term used to describe an ancient tool that was made by flaking both sides of a stone. Synonyms for the word biface depend on the context in which it is used. In archeology, the term lithic artifact may be used to describe such tools. In geology, the term flake is often used to describe the chips of stone that are created during the manufacturing process. Similarly, the term chopper may be used to describe a type of biface tool that was used for chopping wood or other materials. Other synonyms for biface depend on the specific region or time period under discussion. Overall, however, biface is the most commonly used term for these types of ancient tools.