Lexical Definition

‎μετρητής‎ metrētḗs (met-ray-tace') measure ^G:N-M
from ‎μετρέω‎

firkin.

• a measurer, i.e. (specially), a certain standard measure of capacity for liquids

Abbott-Smith

μετρητής, -οῦ, ὁ (< μετρέω), [in LXX: III Ki 18:32 (סְאָה), II Ch 4:5, (בַּת), etc.;]
1. a measurer (Plat.).
2. = ἀμφορεύς, an Attic measure, = 1 1⁄2 Roman amphoræ or about 9 Eng. gallons: Jo 2:6.†

Abbott-Smith References

Liddell-Scott-Jones

μετρητής-ητής, οῦ, ὁ,

measurer, [Refs 5th c.BC+]; μετρητήςηταὶ στρατοπέδων, = Latin metatores castrorum, [Refs 1st c.AD+]

__II a liquid measure, = {ἀμφορεύς}, [Refs 5th c.BC+] “*Mens.” 9, etc.; of the Hebrew bath, [LXX+NT]

_{LSJ Scripture Refs: LXX.1Kgs.18.32 ☩ John.2.6}