Etymology
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marina (n.)
1805, "a promenade by the sea," from Spanish or Italian marina "shore, coast," from Latin marinus "of the sea, maritime," from mare "sea, the sea, seawater," from PIE root *mori- "body of water." Meaning "dock or basin with moorings for yachts and small craft" is 1935, American English.
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*mori- 

Proto-Indo-European root meaning "body of water."

It forms all or part of: aquamarine; Armorica; beche-de-mer; cormorant; mare (n.2) "broad, dark areas of the moon;" marina; marinate; marine; mariner; maritime; marsh; mere (n.1) "lake, pool;" Merlin; mermaid; merman; meerschaum; meerkat; morass; Muriel; rosemary; submarine; ultramarine; Weimar.

It is the hypothetical source of/evidence for its existence is provided by: Latin mare; Old Church Slavonic morje, Russian more, Lithuanian marės, Old Irish muir, Welsh mor "sea;" Old English mere "sea, ocean; lake, pool," German Meer "sea."

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aquamarine (n.)
1590s, agmarine, "bluish-green type of beryl," from French or Provençal, from Latin aqua marina "sea water," from aqua "water" (from PIE root *akwa- "water") + marina, fem. of marinus "of the sea" (from PIE root *mori- "body of water"). Apparently first used as a description of a bluish-green color by John Ruskin, 1846. Abbreviation aqua is attested from 1936.
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marinade (n.)

"a pickle for fish or meat, generally of wine and vinegar with herbs and spices," 1704, from French marinade "spiced vinegar or brine for pickling," from mariner "to pickle in (sea) brine," from Old French marin (adj.) "of the sea," from Latin marinus "of the sea," from mare "sea, the sea, seawater," from PIE root *mori- "body of water." As a verb, "to steep in a marinade," from 1680s. Related: Marinaded; marinading.

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marinate (v.)

"to pickle (fish, meat) in a marinade," 1640s, from French mariner "to pickle in (sea) brine," from Old French marin (adj.) "of the sea," from Latin marinus "of the sea," from mare "sea, the sea, seawater," from PIE root *mori- "body of water." Related: Marinated; marinating.

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