'Pleiades' definitions:

Definition of 'Pleiades'

noun

(Greek mythology) 7 daughters of Atlas and half-sisters of the Hyades; placed among the stars to save them from the pursuit of Orion

noun

A star cluster in the constellation Taurus

From: GCIDE

Pleiades \Ple"ia*des\ (?; 277), n. pl. [L., fr. Gr. (?)]
1. (Myth.) The seven daughters of Atlas and the nymph Pleione, fabled to have been made by Jupiter a constellation in the sky. [1913 Webster]
2. (Astron.) A group of small stars in the neck of the constellation Taurus; -- called also the seven sisters. --Job xxxviii. 31. [1913 Webster]
Note: Alcyone, the brightest of these, a star of the third magnitude, was considered by M[aum]dler 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. [1913 Webster +PJC]

Pleiades Heb. kimah, "a cluster" (Job 9:9; 38:31; Amos 5:8, A.V., "seven stars;" R.V., "Pleiades"), a name given to the cluster of stars seen in the shoulder of the constellation Taurus.