Jennifer Su arm [ahrm] –noun 1. the upper limb of the human body, especially the part extending from the shoulder to the wrist. 2. the upper limb from the shoulder to the elbow. 3. the forelimb of any vertebrate. 4. some part of an organism like or likened to an arm. a home a b c d e f g h i j k l m n o p q r s t u v w x y z altitude ambiance antique anonymous antler apocalyptic alligator alone altered apple-juice arm art as-az