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