Orion

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Greek Mythology A giant hunter, pursuer of the Pleiades and lover of Eos, killed by Artemis.
2. n. A constellation in the celestial equator near Gemini and Taurus, containing the stars Betelgeuse and Rigel.

Century Dictionary and Cyclopedia

1. n. A constellation situated in the southern hemisphere with respect to the ecliptic, but the equinoctial crosses it nearly in the middle. This constellation is represented by the figure of a giant with a sword by his side. It contains seven stars which are very conspicuous to the naked eye; four of these form a quadrangle, and the other three are situated in the middle of it in a straight line, forming what is called the Belt or Girdle of Orion. They are also popularly called Jacob's-slaff, Our Lady's wand, the Yard-wand, etc. Orion also contains a remarkable nebula. See cut in preceding column.
2. n. In entomology, a genus of cerambycid beetles, with two South American species, founded by Guérin in 1843.

Wiktionary

1. n. Greek mythology A giant-hunter, pursuer of the Pleiades and lover of Eos, and killed by Artemis.
2. n. astronomy A constellation on the celestial equator close to Gemini and Taurus, containing the stars Betelgeuse and Rigel.
3. n. A male given name of modern usage.

GNU Webster's 1913

1. n. (Astron.) A large and bright constellation on the equator, between the stars Aldebaran and Sirius. It contains a remarkable nebula visible to the naked eye.

WordNet 3.0

1. n. a constellation on the equator to the east of Taurus; contains Betelgeuse and Rigel
2. n. (Greek mythology) a giant Boeotian hunter who pursued the Pleiades and was eventually slain by Artemis; was then placed in the sky as a constellation