出典:Wiktionary
出典:『Wiktionary』 (2026/05/13 20:23 UTC 版)
Learned borrowing from Latin lacūna (“a ditch, pit; a hollow, cavity; a gap, defect”). Doublet of lacune and lagoon.
lacuna (plural lacunae or (obsolete) lacunæ or lacunas)
Nominalization of *lacūnus (“pertaining to a lake, cistern”), itself from lacus (“a lake, pond; a basin, tank, cistern”) + -nus. Compare opportūnus and importūnus, from portus. For its substantivation, probably from the clipping of lacūna aqua “cistern water”, compare urīna with similar development.
First-declension noun.
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