Pleiades

UK: /ˈplaɪəˌdiːz/ US: (plē′ə dēz′, plī′-)

WordReference Random House Unabridged Dictionary of American English © 2025

Ple•ia•des  (plē′ə dēz′, plī′-), n.pl. 

1. Mythology [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. Astronomy a conspicuous group or cluster of stars in the constellation Taurus, commonly spoken of as seven, though only six are visible.

• Greek Pleíades (singular Pleías); akin to pleîn to sail
• Latin Plīades
• Middle English Pliades 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

Pleiades / ˈplaɪəˌdiːz/ noun:plural

1. the seven daughters of Atlas, placed as stars in the sky either to save them from the pursuit of Orion or, in another account, after they had killed themselves for grief over the death of their half-sisters the Hyades

Pleiades / ˈplaɪəˌdiːz/ noun:plural

1. a young conspicuous open star cluster approximately 370 light years away in the constellation Taurus, containing several thousand stars only six or seven of which are visible to the naked eye
   Compare Hyades1