a small zodiacal constellation in the N hemisphere lying between Taurus and Pisces on the ecliptic and having a second-magnitude star
2. astrology
a. Also called: the Ram
the first sign of the zodiac, symbol ♈, having a cardinal fire classification, ruled by the planet Mars. The sun is in this sign between about March 21 and April 19
b.
a person born during the period when the sun is in this sign