Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ethnarch is a noun meaning "the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority". It carries one recorded sense.
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ethnarch come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.