Scorpio

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. See Scorpius.
2. n. The eighth sign of the zodiac in astrology.
3. n. One who is born under this sign.

Century Dictionary and Cyclopedia

1. n. In zoology, a Linnean genus of arachnidans, equivalent to the modern order Scorpionida, used with various restrictions, now the type of the limited family Scorpionidæ. See scorpion.
2. n. A constellation and the eighth sign of the zodiac, represented by the character ♏. The constellation, which is prominent in early summer in the skies of the southern United States (where the whole of the magnificent tail clears the horizon), contains the firstmagnitude red star Antares and several of the second magnitude. With the Chaldeans and Greeks it extended over one sixth of the planetary circle, the scorpion being represented with exaggerated claws embracing a circular space where Libra is now placed. From this irregularity it may be inferred that the constellation is older than the zodiac, which was formed before 2000 b. c. Libra, though later, is of no small antiquity, since it appears in the Egyptian zodiacs. Its adoption by Julius Cæsar in his calendar made it familiar. Ptolemy, however, though living in Egypt nearly two centuries later, follows Babylonian and Greek astronomers in covering the place of Libra with the scorpion's claws. In designating the stars of this constellation by means of the Greek letters, the genitive Scorpii (from the alternative Latin form scorpius: see scorpion) is used: thus, Antares is a Scorpii.

Wiktionary

1. n. : A constellation of the zodiac, roughly shaped like a scorpion. Its brightest star is the red giant Antares.
2. n. : The Zodiac sign for the scorpion, covering October 22 - November 22.
3. n. Someone with a Scorpio star sign
4. n. : A constellation of the zodiac, roughly shaped like a scorpion. Its brightest star is the red giant Antares.
5. n. : The Zodiac sign for the scorpion, covering October 22 - November 22.
6. n. Someone with a Scorpio star sign

GNU Webster's 1913

1. n. A scorpion.
2. n. The eighth sign of the zodiac, which the sun enters about the twenty-third day of October, marked thus [♏] in almanacs.
3. n. A constellation of the zodiac containing the bright star Antares. It is drawn on the celestial globe in the figure of a scorpion.

WordNet 3.0

1. n. a large zodiacal constellation between Libra and Sagittarius
2. n. (astrology) a person who is born while the sun is in Scorpio
3. n. the eighth sign of the zodiac; the sun is in this sign from about October 23 to November 21