Masculine

lacus

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(declension-4, masculine) a lake, pond, basin; reservoir
(declension-4, masculine) a tank, tub, sink, vat, wine-vat

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Pronounced as (IPA)

[ˈɫa.kʊs]

From Proto-Italic *lakus, from Proto-Indo-European *lókus (“lake, pool”); the reason for the change to *a is debated, but likely from velarized *[ɫ]. Cognate with Ancient Greek λάκκος (lákkos, “cistern, tank, pit”) and Old English lagu (“sea, ocean, flood”). More at lay.