Webster's Revised Unabridged Dictionary · 1913

Pleiades

Pleiades (?; 277) , noun, plural

[Latin, from Greek ({not transcribed})]

1.
(Mythology) The seven daughters of Atlas and the nymph Pleione, fabled to have been made by Jupiter a constellation in the sky.
2.
(Astronomy) A group of small stars in the neck of the constellation Taurus; -- called also the seven sisters. — Job xxxviii. 31

Alcyone, the brightest of these, a star of the third magnitude, was considered by Madler the central point around which our universe is revolving, but such a notion has been thoroughly discounted by modern observations. Only six pleiads are distinctly visible to the naked eye, whence the ancients supposed that a sister had concealed herself out of shame for having loved a mortal, Sisyphus.