
Spanish word mar comes from Proto-Indo-European *mer-, and later Proto-Indo-European *móri (Sea.)
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*mer- (Proto-Indo-European)
die, to rub, pack, to shimmer, shine, to die
*móri (Proto-Indo-European)
Sea.
*mari (Proto-Italic)
Sea.
mare (Latin)
Sea.
mar (Spanish)
(la mar de) really; hella. (la mar) loads. (selenology) lunar mare. Sea. Seaside.