The Collaborative International Dictionary of English v.0.48:

Wex \Wex\, v. t. & i.
   To grow; to wax. [Obs.] --Chaucer. "Each wexing moon."
   --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wex \Wex\, obs. imp. of Wex.
   Waxed. --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wex \Wex\, n.
   Wax. [Obs.] "Yelwe as wex." --Chaucer.
   [1913 Webster]