στατήρ, -ῆρος, ὁ [in Aq., Sm., for מִשְׁקָל ;] a stater; __(a) a weight; __(b) a coin (used by late writers of the Greek τετράδραχμον): Refs Mat.17:27 26:16, WH, mg.† (AS)
Thayer:
1) a stater, a coin 1a) in the NT a silver stater equal to four Attic or two Alexandrian drachmas, a Jewish shekel
στατήρ
statēr
stat-air'
From the base of G2746; a stander (standard of value), that is, (specifically) a stater or certain coin