arm

/ɑrm/ n [C] (BODY PART)

Definition

› either of the two long parts of the upper body that are joined to the shoulders and have hands at the end: Her arm was bandaged from elbow to wrist. He held his young son in his arms (= closely). › The arm of a piece of clothing or furniture is a part of it that you put your arm in or on: the arm of a jacket/chair › An arm of an organization is a part of it with particular responsibilities: the company's investment banking arm

(Definition of arm n (BODY PART) from the Cambridge Academic Content Dictionary © Cambridge University Press)