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Latin word lacus comes from Proto-Indo-European *lakw-, Proto-Indo-European *lokus, and later Proto-Indo-European *lókus (Pond, pool.)
*lakw- (Proto-Indo-European)
lake, pond, lake, pool, water, body of water, lake
*lokus (Proto-Indo-European)
*lókus (Proto-Indo-European)
Pond, pool.
*lakus (Proto-Italic)
Lake.
lacus (Latin)
A lake, pond, basin; reservoir. A tank, tub, vat, sink.