Lewis & Short

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2. Castor, ŏris (acc. to some gramm. Castōris, Quint. 1, 5, 60), m., = Κάστωρ.

  1. I. The son of the Spartan king Tyndarus and Leda, brother of Helena and Pollux, with whom, as twin star (Gemini; hence even Castores, Plin. 10, 43, 60, § 121; 35, 4, 10, § 27; 7, 22, 22, § 86; and: alter Castor, Stat. S. 4, 6, 16), he served as a guide to mariners, Varr. L. L. 5, § 58; Cic. N. D. 2, 2, 6; 3, 18, 45; Hor. Ep. 2, 1, 5; id. Epod. 17, 42; 17, 43; id. C. 4, 5, 35: gaudet equis, id. S. 2, 1, 26; cf. id. C. 1, 12, 25, and Ov. M. 12, 401: ad Castoris (sc. aedem), on the forum, Cic. Mil. 33, 91; where pecuniary affairs were transacted, id. Quint. 4, 17; cf. Juv. 14, 260.
  2. II. Derivv.
    1. A. In oaths: ecastor and mecastor [the old interj. e or the pron. acc. me, prefixed; cf.: equidem, edepol; mehercle, medius fiduis, etc., v. Corss. Ausspr. II. p. 856 sq.], by Castor, an oath in very frequent use, especially by women, though not exclusively by them, as asserted by Gell. 11, 6, 1, and Charis. p. 183 P.; cf. Plaut. As. 5, 2, 46; 5, 2, 80; id. Cas. 5, 4, 13: ecastor, re experior, quanti facias uxorem tuam, id. Am. 1, 3, 10; 1, 3, 39; id. Cist. 4, 2, 61; id. Truc. 2, 5, 28; id. Poen. 1, 2, 71; id. Stich. 1, 3, 89; id. As. 1, 3, 36; id. Truc. 2, 2, 60; id. As. 3, 1, 30; id. Stich. 1, 3, 81: ecastor vero, id. Merc. 4, 1, 25: per ecastor scitus (i. e. perscitus ecastor) puer est natus Pamphilo, Ter. And. 3, 2, 6: nec nunc mecastor quid hero ego dicam queo comminisci, Plaut. Aul, 1, 1, 28; cf. id. Merc. 4, 1, 6; id. Cas. 2, 3, 30; id. Men. 4, 2, 50; id. Mil. 1, 1, 63; cf. also id. Stich. 1, 3, 86; id. Truc. 2, 2, 36; 2, 7, 30; 3, 2, 11; 4, 4, 9; 5, 1, 26: Sy. Salve, mecastor, Parmenio. Pa. Et tu, edepol, Syra, Ter. Hec. 1, 2, 8 Don.
    2. B. Ad Castŏris or Lŏcus Ca-stŏrum, nom. propr., a place in Upper Italy, between Cremona and Bedriacum, where stood a shrine of Castor and Pollux, Suet. Oth. 9; Tac. H. 2, 24.
    3. C. Castŏrĕus, a, um, adj. of Castor: manus, Sen. Hippol. 810.
  3. III. A companion of Æneas, Verg. A. 10, 124.
  4. IV. The grandson of king Deiotarus, Cic. Deiot. 1, 2, 10; 1, 2, 28 sq.
  5. V. Castor Tarcondarius, a chieftain of Gallogrœcia, ally of Pompey, Caes. B. C. 3, 4.
  6. VI. Antonius Castor, an author on botany, Plin. 25, 17, 66, § 174; 25, 2, 5, § 9.

Castŏrĕus, a, um, v. 2. Castor, II. C.