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