Characterized by excessive obsession with ethnic matters, ethnological study, or ethnic identity; showing signs of ethnomania.
From ethnomaniac + -ic (suffix meaning 'of or pertaining to'). A rarely used term from scholarly discourse of the 19th-20th centuries.
Words like 'ethnomanic' reveal period attitudes—Victorian scholars sometimes mocked those who spent too much time studying 'primitive' cultures, now we'd call that dedication to one's field.
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