lacus.
basin/tank/tub; lake/pond; reservoir/cistern/basin, trough; lime-hole; bin; pit;
Meaning & usage
a lake, pond, basin; reservoir
a tank, tub, sink, vat, wine-vat
Where this word comes from
According to De Vaan, from Proto-Italic *lakus, from Proto-Indo-European *lókus (“lake, pool”); the reason for the change to *a is debated, but perhaps from velarized *[ɫ]. Regarding this proposed phonological development, Schrijver notes that the form lacus may be the only positive evidence for such a sound law, rendering the existence of the rule uncertain. Cognate with Ancient Greek λάκκος (lákkos, “cistern, tank, pit”) and Old English lagu (“sea, ocean, flood”). More at lay.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.