Etymology
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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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*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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