Pronunciation: (u-rī'un), [key]
—gen. Or•i•o•nisPronunciation: (ôr"ē-ō'nis, or"-, u-rī'u-nis) [key] 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.