/euh ruy"euhn/ , n., gen. Orionis /awr'ee oh"nis, or'-, euh ruy"euh nis/ for 2.
1. Class. Myth. a giant hunter who pursued the Pleiades, was eventually slain by Artemis, and was then placed in the sky as a constellation.
2. Astron. the Hunter, a constellation lying on the celestial equator between Canis Major and Taurus, containing the bright stars Betelgeuse and Rigel.
3. Mil. a land-based U.S. Navy patrol plane with four turboprop engines, used to detect, track, and destroy enemy submarines and armed with missiles, torpedoes, mines, and depth bombs.