Biceps brachii is a term that is mostly used in anatomy and physiology. This refers to a muscle composed of two heads, attached to the upper arm bone and running through the elbow joint, which is responsible for flexing the forearm and supinating the hand. Synonyms for biceps brachii include "arm muscle," "upper arm muscle," "bicep muscle," and "brachial biceps." These terms are often used interchangeably to refer to the same muscle and are commonly used by fitness and medical professionals to describe and strengthen the muscle. Understanding the synonyms of biceps brachii can help individuals to better understand the function and importance of this muscle in the body.