Arm

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"

A long, narrow, more or less rigid part of an object extending from the main part or centre of the object, such as the arm 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."

To take by the arm; to take up in one's arms.

Poor; lacking in riches or wealth.

To be pitied; pitiful; wretched.

(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.

To supply with armour or (later especially) weapons.

"The king armed his knights with swords and shields."

To prepare a tool or a weapon for action; to activate.

"Remember to arm the alarm system before leaving for work."

To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency.

"to arm the hit of a sword; to arm a hook in angling"

To furnish with means of defence; to prepare for resistance; to fortify, in a moral sense.