'Burthen' definitions:

Definition of 'burthen'

(from WordNet)
noun
A variant of `burden'
verb
Weight down with a load [syn: burden, burthen, weight, weight down] [ant: disburden, unburden]

Definition of 'Burthen'

From: GCIDE
  • Burthen \Bur"then\, n. & v. t. See Burden. [Archaic] [1913 Webster]