1) a measurer, the name of a utensil known as a amphora, which is a species of measure used for liquids and containing somewhat less the nine English gallons or about (40 l)
Part of Speech: noun masculine
From G3354; a measurer, that is, (specifically) a certain standard measure of capacity for liquids: - firkin.
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 μετρητής; click on the second column to search for that grammatical form of the root μετρητής; click on the third column to search for that word and grammatical form; click on the total to search for the root μετρητής.