Pronunciation: (plē'u-dēz", plī'-),[key] —n.pl. 1. Class. Myth.seven daughters of Atlas and half sisters of the Hyades, placed among the stars to save them from the pursuit of Orion. One of them (the Lost Pleiad ) hides, either from grief or shame.
2. Astron.a conspicuous group or cluster of stars in the constellation Taurus, commonly spoken of as seven, though only six are visible.