noun
Scorpius; the Scorpion
The constellation Scorpius, one of the 88 modern constellations. In astrology, it corresponds to the zodiac sign Scorpio.
夏の夜空にさそり座がよく見える。
The constellation Scorpius is clearly visible in the summer night sky.
さそり座の一等星はアンタレスです。
The first-magnitude star of Scorpius is Antares.
さそり is the general word for 'scorpion' (the animal), while さそり座 specifically refers to the constellation.
Compound of さそり (scorpion) + 座 (constellation). The kanji 蠍 and 蝎 both mean 'scorpion'.