Pronunciation: (hī'u-dēz"),[key] —n.(used with a pl. v.) 1. Astron.a group of stars comprising a moving cluster in the constellation Taurus, supposed by the ancients to indicate the approach of rain when they rose with the sun.
2. Class. Myth.a group of nymphs and sisters of the Pleiades who nurtured the infant Dionysus and were placed among the stars as a reward. Also,Hy•adsPronunciation: (hī'adz).[key]