Wordnet 3.0
NOUN (1)
1.
the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority;
- Example: "the election of Makarios III to archbishop gave him the status of the ethnarch of Cyprus"
The Collaborative International Dictionary of English v.0.48:
Ethnarch \Eth"narch\, n. [Gr. ?; ? nation + ? leader, commander.
See -arch.] (Gr. Antiq.)
The governor of a province or people. --Lew Wallace.
[1913 Webster]
WordNet (r) 3.0 (2006):
ethnarch
n 1: the ruler of a province (as in the Roman Empire and
Byzantine Empire) or certain religious rulers with secular
authority; "the election of Makarios III to archbishop gave
him the status of the ethnarch of Cyprus"