English

muscle noun definition in Internal anatomy topic from the Oxford Advanced Learner's Dictionary

muscle

 noun: Internal anatomy topic
[countable, uncountable] a piece of body tissue that you contract and relax in order to move a particular part of the body; the tissue that forms the muscles of the body a calf/neck/thigh muscle to pull/tear/strain a muscle This exercise will work the muscles of the lower back. She tried to relax her tense muscles. He felt every muscle in his body tighten. He didn't move a muscle (= stood completely still).