1) a sextarius
1a) a vessel for measuring liquids, holding about a pint (.5 litre)
2) a wooden pitcher or ewer from which water or wine is poured, whether holding a sextarius or not
Part of Speech: noun masculine
As if from ξέω xeô (which properly means to smooth; by implication [of friction] to boil or heat); a vessel (as fashioned or for cooking), (or perhaps by corruption from the Latin sextarius, the sixth of a modius, that is, about a pint), that is, (specifically) a measure for liquids or solids, (by analogy a pitcher): - pot.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ξέστης; click on the second column to search for that grammatical form of the root ξέστης; click on the third column to search for that word and grammatical form; click on the total to search for the root ξέστης.