Lewis & Short

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Ostĭa, ae, f., and Ostĭa, ōrum, n. [ostium; cf. Engl. mouth, in Ply-mouth, Yar-mouth, etc.],

  1. I. a seaport town in Latium, at the mouth of the Tiber, built by Ancus Marcius, still called Ostia: Ostiam urbem ad exitum Tiberis in mare fluentis Ancus Marcius rex condidisse fertur, Paul. ex Fest. p. 197 Müll.; cf.: urbs, quam secundum ostium Tiberis (Ancus Marcius) posuit, ex quo etiam Ostiam. id. s. v. Quiritium, p. 254 ib.; Enn. ap. Paul. ex Fest. s. v. quaeso, p. 258 ib. (Ann. v. 145 Vahl.): in ore Tiberis Ostia urbs condita, Liv. 1, 33 fin.; Cic. Rep. 2, 3, 5.
    Form Ostia, ōrum, Liv. 9, 19, 4; 23, 37, 1.
    Hence,
  2. II. Ostĭen-sis, e, adj., of or belonging to Ostia, Ostian (class.): Ostiensis ager, Cic. Att. 12, 23, 3; Liv. 8, 12: populus, id. 27, 38: quaestor (L. Saturninus), Cic. Sest. 17, 39: portus, Plin. 9, 6, 5, § 14: provincia, the duty of one of the quœstors to superintend the aqueducts leading to Rome, and the supplying of Rome with corn, Cic. Mur. 8, 18; Suet. Claud. 24: incommodum, the capture of the Roman fleet by pirates at Ostia, Cic. Imp. Pomp. 12, 33.

ostĭum, ii, n. [kindred with Sanscr. oshtha, labium; Slav. ūsta, the same; cf. os], a door (class.; cf.: porta, janua, fores, valvae).

  1. I. Lit.: omnia istaec auscultavi ab ostio, Plaut. Merc. 2, 4, 9: observare, id. Mil. 2, 3, 81: rectum ostium, the front-door (cf. posticum), Plaut. Mil. 2, 3, 58 Brix ad loc.: aperire, to open, Ter. Heaut. 2, 3, 35: operire, to shut, id. Phorm. 5, 3, 33: obserare intus, to bolt, id. Eun. 4, 6, 25: obdere pessulum ostio, id. ib. 3, 5, 55: concrepuit ostium a Glycerio, id. And. 4, 1, 58: inscribat aliquis arse verse in ostio, Afran. ap. Fest. p. 18 Müll.: ostium limenque carceris, Cic. Tusc. 5, 5, 13: aperto ostio dormire, id. Rosc. Am. 23, 65: quaerere ab ostio, id. de Or. 2, 68, 276: exactio ostiorum, doortax, id. Fam. 3, 8, 5; v. 2. ostiarius, III.: sepulcri, Dig. 43, 23, 11.
  2. II. Transf., a mouth, an entrance of any kind: Acheruntis ostium in nostrost agro, Plaut. Trin. 2, 4, 124: aperto ex ostio Alti Acheruntis. Poët. ap. Cic. Tusc. 1, 16, 37: sacra Inferni ostia, Verg. G. 4, 467; id. A. 6, 109: ne in rimis areae grana oblitescant, et ostia aperiant muribus ac formicis, entrances, Varr. R. R. 1, 51, 1: portūs, Cic. Verr. 2, 4, 53, § 118: fluminis, mouth, id. Phil. 2, 11, 26; Liv. 24, 40; 44, 6; 44, 45; cf. Rhodani, Caes. B. C. 2, 1: Tiberinaque ad ostia venit, Ov. M. 15, 728; cf. Verg. A. 1, 13: Oceani, i. e. the Strait of Gibraltar, Cic. Imp. Pomp. 12, 33; Mel. 3, 9, 3.
    Fig.: ego sum ostium ovium, Vulg. Johan. 10, 7.