Where does “lacūnārium” come from?

lacūnārium (Latin) comes from Latin lacūnar, from Latin lacūna, from Latin lacus, from New Latin lacrimalis, from Latin lācrima, from Old Latin dacrima, from Proto-Italic *d(r)(k)akrunā, from Proto-Indo-European dáḱru- — eye bitter.

Ancestry of “lacūnārium”, step by step

StepLanguageWordMeaning
1Latinlacūnarceiling, coffered ceiling, a wainscotted and gilded ceiling of an unvaulted chamber
2Latinlacūnaa hole, pit, ditch; especially a pool, pond
3Latinlacusa lake, pond, basin; reservoir; a tank, tub, vat,...
4New Latinlacrimalis
5Latinlācrimaa tear drop of liquid from crying
6Old Latindacrimatear
7Proto-Italic*d(r)(k)akrunā
8Proto-Indo-Europeandáḱru-tears; tear
9Proto-Indo-Europeandr̥ḱ-h₂eḱru-eye bitter

Words derived from “lacūnārium

Every word from Proto-Indo-European dr̥ḱ-h₂eḱru-Every word from Proto-Indo-European dáḱru-Every word from Proto-Italic *d(r)(k)akrunā