limb in WordNet English dictionary

1. any projection that is thought to resemble a human arm
   "the arm of the record player"; "an arm of the sea"; "a branch of the sewer"
   arm  branch  limb 
   
2. the graduated arc that is attached to an instrument for measuring angles
   "the limb of the sextant"
   limb 
   
3. either of the two halves of a bow from handle to tip
   "the upper limb of the bow"
   limb 
   
4. one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
   limb 
   
5. (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet
   limb 
   
6. any of the main branches arising from the trunk or a bough of a tree
   limb  tree branch