The Collaborative International Dictionary of English v.0.48:

Liss \Liss\ (l[i^]s), n. [AS. liss.]
   Release; remission; ease; relief. [Obs.] "Of penance had a
   lisse." --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Liss \Liss\, v. t. [AS. lissan.]
   To free, as from care or pain; to relieve. [Obs.] "Lissed of
   his care." --Chaucer.
   [1913 Webster]