Lewis & Short

Ăristarchus, i, m., = Ἀρίσταρχος, a distinguisled critic of Alexandria, who animadverted with special severity upon the poetry of Homer, and contended that many of his verses were spurious, Cic. Fam. 3, 11; Ov. P. 3, 9, 24.
Appel. for any critic, Cic. Pis. 30: orationes meae, quarum tu Aristarchus es, id. Att. 1, 14.
Hence, Aristar-chēi, ōrum, m., the disciples, followers of Aristarchus, i. e. severe critics, Varr. L. L. 8, § 63 Müll.