'Benthal' definitions:

Definition of 'benthal'

(from WordNet)
adjective
Of or relating to or happening on the bottom under a body of water [syn: benthic, benthal, benthonic]

Definition of 'Benthal'

From: GCIDE
  • Benthal \Ben"thal\, a. [Gr. ? the depth of the sea.] Relating to the deepest zone or region of the ocean. [1913 Webster]