τετρᾶς

ᾶντος, ὁ
A. quadrant of a circle, Vitr. 4.2.4, 4.3.4, 10.6.1.
II. a coin, Lat. quadrans, Hsch.; cf. ἑξᾶς; on the accent cf. Hdn.Gr.1.56.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project