Lewis & Short

gălērum, i, n. (also gălērus, i, m., Verg. A. 7, 688: gălēra, ae, f., C. Gracch. in Charis. p. 61 P.) [galea], a helmet-like covering for the head, made of undressed skin, the Gr. κυνέη, a cap, bonnet, hat (cf.: pileus, petasus, apex).

  1. I. Lit.: flamen Dialis solus album habet galerum, Varr. ap. Gell. 10, 15, 32; so of a priest’s cap, App. Mag. p. 288; cf.: Suetonius tria genera pileorum dixit, quibus sacerdotes utuntur, apicem, tutulum, galerum … galerum pileum ex pelle hostiae caesae, Serv. Verg. A. 2, 683: fulvosque lupi de pelle galeros Tegmen habent capiti, Verg. A. 7, 688 (galerus est genus pilei, quod Fronto genere neutro dicit hoc galerum, Serv. ad h. l.); so Verg. M. 121; Suet. Ner. 26; Grat. Cyneg. 340; Calp. Ecl. 1, 7; Juv. 8, 208; Stat. Th. 1, 305.
  2. II. Transf.
    1. A. A kind of peruke, Suet. Ner. 26 Ruhnk.; Juv. 6, 120.
    2. B. A rose-bud, Aus. Idyll. 14, 25.