Where does “lacuna” come from?

Lacuna comes from Latin lacuna, derived from Latin lacus (lake), from Proto-Italic lakus, from Proto-Indo-European lokus.

lacuna (English): A small opening; a small pit or depression; A...

Definitions

Step	Language	Word	Meaning
1	Latin	lacūna	—
2	Latin	lacus	a lake, pond, basin; reservoir; a tank, tub, vat,...
3	New Latin	lacrimalis	—
4	Latin	lācrima	—
5	Old Latin	dacrima	tear
6	Proto-Italic	*d(r)(k)akrunā	—
7	Proto-Indo-European	dáḱru-	tears; tear
8	Proto-Indo-European	dr̥ḱ-h₂eḱru-	eye bitter

lacuna — Etymology, Origin & Word History | Etymology Explorer