What is the Latin word for reservoir?

The usual Latin words for “reservoir” are lacus, castellum, cisterna. The right choice depends on the sense; see the distinctions below.

English → Latin

“reservoir” in Latin

lacusa lake, pond, basin; reservoir; a tank, tub, sink, vat, wine-vat castellumcastle, fort, citadel, fortress, stronghold; a dwelling in a high place; a shelter, stronghold, defence, refuge cisternacistern, tank (for water), reservoir

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

reservoir

lacus (a large, deep tank): castellum: dividiculum (a building in which water is collected, and thence distributed to other places by pipes): cisterna (a cistern under ground, in which rain-water is kept).

Quick answer

What is the Latin word for reservoir?: The usual Latin words for “reservoir” are lacus, castellum, cisterna. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.