Scorpio

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The eighth sign of the zodiac in astrology.
• noun One who is born under this sign.

from The Century Dictionary.

• noun 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.
• noun A constellation and the eighth sign of the zodiac, represented by the character ♏.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun astronomy : Scorpius
• proper noun astrology : The zodiac sign for the scorpion, ruled by Mars and covering October 24 - November 22 (tropical astrology) or November 16 - December 15 (sidereal astrology).
• noun Someone with a Scorpio star sign

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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