Where does “lacunae” come from?

Lacunae derives from Latin lacuna, meaning a gap or cavity, from lacus meaning lake, ultimately from Proto-Indo-European lokus.

lacunae (English): plural of lacuna

Definitions

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

lacunae — Etymology, Origin & Word History | Etymology Explorer