The headword, nominative plural of this uncommon noun, occurs in Homer, Iliad 5.158 (web address 1), which finds an echo in Hesiod, Theogony 607 (web address 2). For the gloss cf. the Homeric scholia; also the Etymologicum of Orion [Author, Myth] 166.1 (whence derive entries in other lexica).
LSJ s.v. (web address 3) translates and glosses thus: 'far-off kinsmen, who seize and divide among themselves the property of one who dies without heirs (xh=ros)'.