benthal

from WordNet (r) 3.0 (2006)
benthal
    adj 1: of or relating to or happening on the bottom under a body
           of water [syn: {benthic}, {benthal}, {benthonic}]
    
from The Collaborative International Dictionary of English v.0.48
Benthal \Ben"thal\, a. [Gr. ? the depth of the sea.]
   Relating to the deepest zone or region of the ocean.
   [1913 Webster]
    

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