Meaning

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

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

originFrom Middle English lyme, lim, from Old English lim (“limb, branch”), from Proto-West Germanic *limu, from Proto-Germanic *limuz (“branch, limb”). Cognate with Old Norse limr (“limb”). The spelling with the silent unetymological -b first arose in the late 1500s. Compare crumb.

Etymology from Wiktionary, CC BY-SA 3.0