Source : Webster's Revised Unabridged Dictionary (1913)

Bathymetric \Bath`y*met"ric\, Bathymetrical \Bath`y*met"ric*al\,
   a.
   Pertaining to bathymetry; relating to the measurement of
   depths, especially of depths in the sea.

Source : WordNet®

bathymetrical
     adj : of or relating to measurements of the depths of oceans or
           lakes [syn: {bathymetric}]