From BiblePortal Wikipedia
Webster's Dictionary 
(1): ( n.) A sign of the zodiac which the sun enters about the 21st of August, marked thus [/] in almanacs.
(2): ( n.) A constellation of the zodiac, now occupying chiefly the sign Libra, and containing the bright star Spica.
King James Dictionary 
Vir'Go, n. L. A sign of the zodiac which the sun enters in August a constellation, containing according to the British catalogue, one hundred and ten stars.