Noah Webster's New International Dictionary of the English Language

1. (v. t.) To disunite in almost any manner, either by rending, cutting, or breaking; to part; to put or keep apart; to separate; to divide; to sever; as, to sunder a rope; to sunder a limb; to sunder friends.

2. (v. i.) To part; to separate.

3. (n.) A separation into parts; a division or severance.

4. (v. t.) To expose to the sun and wind.