azimuthal

from WordNet (r) 3.0 (2006)

azimuthal
    adj 1: of or relating to or in azimuth

from The Collaborative International Dictionary of English v.0.48

Azimuthal \Az"i*muth`al\, a.
   Of or pertaining to the azimuth; in a horizontal circle.
   [1913 Webster]

   {Azimuthal error} of a transit instrument, its deviation in
      azimuth from the plane of the meridian.
      [1913 Webster]