Lewis & Short

aequor, ŏris, n. [aequus].

  1. I. In gen., an even, level surface (ante-Aug. poet.; only once in Cic. and once in Sallust): speculorum aequor, a plane surface, as of a mirror, Lucr. 4, 106; 291: in summo aequore saxi, upon the polished, smooth marble surface, id. 3, 905: camporum patentium aequora, * Cic. Div. 1, 42: campi, Verg. A. 7, 781; and without campus: Daren ardens agit aequore toto, id. ib. 5, 456: at prius ignotum ferro quam scindimus aequor, id. G. 1, 50; 1, 97; of the desert, id. ib. 2, 105: immensum spatiis confecimus aequor, id. ib. 541: primus in aequore pulvis, Juv. 8, 61; and once of the heavens: aequora caeli Sensimus sonere, Att. ap. Non. 505, 8 (Trag. Rel. p. 139 Rib.).
  2. II. Esp., the even surface of the sea in its quiet state, the calm. smooth sea (“aequor mare appellatum, quod aequatum, cum commotum vento non est,” Varr. L. L. 7, § 23 Müll.: quid tam planum videtur quam mare? ex quo etiam aequor illud poëtae vocant, Cic. Ac. Fragm. ap. Non. 65, 2 (cf. πόντου πλάξ, Pind. P. 1, 24).
    Also, in gen., the sea, even when agitated by storms, Lucr. 1, 719: turbantibus aequora ventis, id. 2, 1: silvaeque et saeva quiērant aequora, Verg. A. 4, 523 et saep.: per undosum aequor, id. ib. 313: contracta pisces aequora sentiunt, Hor. C. 3, 1, 33: juventus Infecit aequor sanguine Punico, id. ib. 3, 6, 34 al.
    Sometimes pleonast. with mare or pontus: vastum maris aequor arandum, Verg. A. 2, 780: tellus et aequora ponti, id. G. 1, 469.
    Of the surface of the Tiber, Verg. A. 8, 89 and 96 (so, mare of the Timavus, id. ib. 1, 246; and unda of rivers, as of the Simoïs, id. ib. 1, 618).
    In prose writers after the Aug. per.: placidum aequor, Tac. A. 2, 23: penetrare aequora, Val. Max. 9, 1, 1; so Curt. 4, 7; Plin. 4, 12, 24, § 76; Mel. 1, 2. Once even in Sallust: aequore et terrā, Sall. Fragm. ap. Don. ad Ter. Phorm. 2, 1, 13 (p. 390, n. 81 Kritz.) dub.