Altazimuth :: Altazimuth (n.) An instrument for taking azimuths and altitudes simultaneously.
Azimuth :: Azimuth (n.) The quadrant of an azimuth circle.
Azimuth :: Azimuth (n.) An arc of the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying..
Azimuthal :: Azimuthal (a.) Of or pertaining to the azimuth; in a horizontal circle.