The Collaborative International Dictionary of English v.0.48:

Disgavel \Dis*gav"el\, v. t. [imp. & p. p. Disgaveledor
   Disgaveled; p. pr. & vb. n. Disgaveling.] [See
   Gavelkind.] (Eng. Law)
   To deprive of that principal quality of gavelkind tenure by
   which lands descend equally among all the sons of the tenant;
   -- said of lands. --Burrill.
   [1913 Webster]