[f. alt. for ALTITUDE + AZIMUTH.] An instrument, invented by Prof. Airy, for determining the altitude and azimuth of a heavenly body.
1860. Dunkin, Handbk. Astron., § 49. The Greenwich altazimuth instrument.
1868. Lockyer, Elem. Astron., § 523. To make an observation with the altazimuth.
1876. Chambers, Astron., 640. A form of altazimuth mounting for Newtonian Reflectors.
