Bathy*met"ric*al*ly

from The Collaborative International Dictionary of English v.0.48

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. --
   {Bath`y*met"ric*al*ly}, adv.
   [1913 Webster]