tritorium
A vessel for separating liquids of different densities.
obsolete
The receivers should be emptied, by means of a tin funnel, into the tin or pewter tritorium described p. 30; and the crude spirit kept there till it be wanted for rectification; or, if the tritorium will not contain all that may happen to be made, this spirit may be drawn off […]
Where it comes from
Compare Latin terere, tritum (“to rub”).
Adapted from the Wiktionary entry tritorium (CC BY-SA 4.0).