noun The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
She stood with her right arm extended and her palm forward to indicate “Stop!”
noun The extended portion of the upper limb, from the shoulder to the elbow.
The arm and forearm are parts of the upper limb in the human body.
noun A limb, or locomotive or prehensile organ, of an invertebrate animal.
the arms of an octopus
noun The part of a piece of clothing that covers the arm.
noun A long, narrow, more or less rigid part of an object extending from the main part or centre of the object, such as the armrest of an armchair, a crane, a pair of spectacles or a pair of compasses.
The robot arm reached out and placed the part on the assembly line.