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!””

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.”

A limb, or locomotive or prehensile organ, of an invertebrate animal.

“the arms of an octopus”

(usually used in the plural) A weapon.

(in the plural) Heraldic bearings or insignia.

“The Duke's arms were a sable gryphon rampant on an argent field.”

(in the plural) War; hostilities; deeds or exploits of war.