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tridrachm

tridrachm Gr. Antiq.
  (ˈtraɪdræm)
  [ad. Gr. τρίδραχµον, f. τρι- tri- + δραχµή drachm.]
  A silver coin of ancient Greece, of the value of three drachms: see drachm 1.

1771 Raper in Phil. Trans. LXI. 469 Their larger Coins above the Drachm were, the Didrachm, the Tridrachm, and the Tetradrachm. 1827 Robinson Archæol. Græca v. xxvi. (ed. 2) 550, 3 dr[achmæ] or tridrachm, 1/111/4. 1842 Smith's Dict. Grk. & Rom. Antiq. s.v. Drachma, Among those [silver coins] now preserved, the tetradrachm is commonly found; but we possess no specimens of the tridrachm, and only a few of the didrachm.

Oxford English Dictionary

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