Arietian vs Arian - What's the difference?

As an adjective arietian

is (astrology) of or pertaining to the astrological sign of aries.

is (astrology) person born under the astrological sign of aries.

to show mercy to, spare.

(-)

(astrology) Of or pertaining to the astrological sign of Aries.

(en noun)

(astrology) Person born under the astrological sign of Aries.

* Aries

From Arianus.

(en noun)

(Christianity) A disciple of the Egyptian monk Arius, presbyter of Alexandria, who denied the Trinity but did not deny the preexistence of Christ.

# One who follows the Christology of Arianism.

# A heretic or any heresy.

(-)

(Christianity) Of or pertaining to (Arius) or Arianism.

(en noun)

A person whose star sign is Aries

(en noun)