in Greek mythology, the daughter of Idmon of Colophon in Lydia, a dyer in purple.

Arachne was a weaver who acquired such skill in her art that she ventured to challenge Athena, goddess of war, handicraft, and practical reason. Athena wove a tapestry depicting the gods in majesty, while that of Arachne showed their amorous adventures. Enraged at the perfection of her rival's work (or, alternatively, offended by its subject matter), Athena tore it to pieces, and in despair Arachne hanged herself. But the goddess out of pity loosened the rope, which became a cobweb; Arachne herself was changed into a spider, whence the name of the zoological class to which spiders belong, Arachnida. Ovid's Metamorphoses is the chief source of the story.