arm vs ulna

arm

noun
  • The extended portion of the upper limb, from the shoulder to the elbow. 

  • A pitcher 

  • A group of patients in a medical trial. 

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

  • 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 part of a piece of clothing that covers the arm. 

  • One of the two parts of a chromosome. 

  • Heraldic bearings or insignia. 

  • A branch of an organization. 

  • A bay or inlet off a main body of water. 

  • A weapon. 

  • The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand. 

  • Power; might; strength; support. 

adj
  • To be pitied; pitiful; wretched. 

  • Poor; lacking in riches or wealth. 

verb
  • To supply with armour or (later especially) weapons. 

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

  • To take up weapons; to arm oneself. 

  • To fit (a magnet) with an armature. 

  • To prepare (a tool, weapon, or system) for action; to activate. 

  • To supply with the equipment, knowledge, authority, or other tools needed for a particular task; to furnish with capability; to equip. 

  • To become prepared for action; to activate. 

ulna

noun
  • The bone of the forearm that extends from the elbow to the wrist on the side opposite to the thumb, corresponding to the fibula of the hind limb. Also, the corresponding bone in the forelimb of any vertebrate. 

How often have the words arm and ulna occurred in a corpus of books? (source: Google Ngram Viewer )