What is the meaning of limb?

noun

• One of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper.
• Any of the main branches arising from the trunk or a bough of a tree.
  • synonyms: tree branch
• Astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet. (
• Either of the two halves of a bow from handle to tip.
  • usage: "the upper limb of the bow"
• The graduated arc that is attached to an instrument for measuring angles.
  • usage: "the limb of the sextant"
• Any projection that is thought to resemble a human arm.
  • usage: "the arm of the record player"; "an arm of the sea"; "a branch of the sewer"
  • synonyms: arm, branch