paravail

from The Collaborative International Dictionary of English v.0.48

Paravail \Par`a*vail"\, a. [OF. par aval below; par through (L.
   per) + aval down; a- (L. ad) + val (L. vallis) a valley. Cf.
   {Paramount}.] (Eng. Law)
   At the bottom; lowest. --Cowell.
   [1913 Webster]

   Note: In feudal law, the tenant paravail is the lowest tenant
         of the fee, or he who is immediate tenant to one who
         holds over of another. --Wharton.
         [1913 Webster] Paravant

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

PARAVAIL. Tenant paravail is the lowest tenant of the fee, or he who is the 
immediate tenant to one who holds of another. He is called tenant paravail, 
because it is presumed he has the avails or profits of the land. F. N. B. 
135; 2 Inst, 296.