Definition of Demosthenian in English:
Demosthenian
(also Demosthenean)
adjective ˌdiːməsˈθiːnɪən
Origin
Early 17th century; earliest use found in Thomas Shelton (fl. 1598–1629), translator. From Hellenistic Greek Δημοσθένειος Demosthenic + -an; compare -ian.