Source : Webster's Revised Unabridged Dictionary (1913)

Kex \Kex\, n. [W. cecys, pl., hollow stalks.]
   1. (Bot.) A weed; a kecksy. --Bp. Gauden.

            Though the rough kex break The starred mosaic.
                                                  --Tennyson.

   2. A dry husk or covering.

            When the kex, or husk, is broken, he proveth a fair
            flying butterfly.                     --Holland.