limb

noun

1. 1

   any projection that is thought to resemble a human arm

   the arm of the record player

   an arm of the sea

2. 2

   the graduated arc that is attached to an instrument for measuring angles

   the limb of the sextant

3. 3

   either of the two halves of a bow from handle to tip

   the upper limb of the bow

4. 4

   one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper

5. 5

   (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet

6. 6

   any of the main branches arising from the trunk or a bough of a tree