noun (used with a plural verb)
Astronomy. 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.
Classical Mythology. 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 [hahy-adz] .

1350–1400; Middle English Hiades < Latin < Greek, equivalent to (ein) to rain + -ades, plural of -as -ad

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World English Dictionary
Hyades or Hyads1 (ˈhaɪəˌdiːz, ˈhaɪædz)
pl n
Compare Pleiades an open cluster of stars in the constellation Taurus
[C16: via Latin from Greek huades, perhaps from huein to rain]
Hyads or Hyads1
pl n
[C16: via Latin from Greek huades, perhaps from huein to rain]

Hyades2 (ˈhaɪəˌdiːz)
pl n
Greek myth seven nymphs, daughters of Atlas, whom Zeus placed among the stars after death

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

star cluster in constellation Taurus, late 14c., from Gk. Hyades, popularly explained as "rain-bringers" (from hyein "to rain"), because wet weather supposedly began coincidentally with their heliacal rising, but in fact probably from hys "swine" (the L. word for them was Suculæ "little pigs").
Online Etymology Dictionary, © 2010 Douglas Harper
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