limb

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

(noun) any of the main branches arising from the trunk or a bough of a tree. Synonyms: tree branch.

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

(noun) either of the two halves of a bow from handle to tip. Example: "The upper limb of the bow."

(noun) the graduated arc that is attached to an instrument for measuring angles. Example: "The limb of the sextant."

(noun) any projection that is thought to resemble a human arm. Synonyms: arm, branch. Examples: "The arm of the record player." "An arm of the sea." "A branch of the sewer."