LATIN DICTIONARYLexicon Latīnum
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“sea” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

sea
mare (general term. ☞ The Greek pelagus and pontus are poetical only): oceanus, mare oceanus (the ocean). The high sea, altum (opposed to coast or harbor): the open sea, salum (σάλος; opposed to harbor): at sea, mari: both on land and at sea, terra marique; terra et mari; et terra et mari; et mari et terra; mari atque terra. [The usual expression is terra marique; the others are used only in cases where more stress is laid on either, or where the style is more emphatic; but aqua et terra is not Latin.] To go to sea, mare ingredi; navigationi se committere (opposed to viae se committere, to set out on a road; Vid: Cic., Fam., 16, 4, in.): to be at sea, mari navigare: to put to sea [Vid: to set SAIL]; also, altum petere; in altum provehi (to the high sea): the Mediterranean sea, *mare Mediterraneum (☞ the ancients called it, by way of distinction, mare nostrum): the Black Sea, pontus Euxinus; or simply Pontus (also = the country about it): the Adriatic Sea or Gulf of Venice, mare Adriaticum: the Tuscan Sea, mare Etruscum: the Caspian Sea, mare Caspium: the Red Sea, sinus Arabicus: the Dead Sea, lacus Asphaltites: that is situate or takes place upon the sea, maritimus: in the sea, marlnus: beyond the sea, transmarinus: to be on the level of the sea, locus pari libra cum aequore maris est (Col., 8, 17). Empire of the sea, imperium maris (☞ imperii maritimi summa, in Nep., Arist., 2, 2 = the chief command at sea): command at sea, imperium maritimum: adventures at sea, *quae evenerunt in navigatione: dangers of the sea, periculum navigationis

Quick answer

What is the Latin word for sea?
The usual Latin words for “sea” are mare, ōceanus, altus; also sāl. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.