/huy"euh deez'/ , 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, Hyads /huy"adz/ .
[ 1350-1400; ME Hiades hý ( ein ) to rain + -ades, pl. of -AS -AD ]