Webster's Revised Unabridged Dictionary · 1913

Libra

Libra (lī"brȧ) , noun

[Latin, a balance.]

(a)
(Astronomy) The Balance; the seventh sign in the zodiac, which the sun enters at the autumnal equinox in September, marked thus L in almanacs, etc.
(b )
(Astronomy) A southern constellation between Virgo and Scorpio.

Also: Librae