Yes, limb is a Scrabble word!

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

5. The graduated arc that is attached to an instrument for measuring angles

6. Any projection that is thought to resemble a human arm