1881, from hyphen + -ate (2). The earlier verb was simply hyphen (1814). Related: Hyphenated; hyphenating. Hyphenated American "immigrant citizen perceived as having divided loyalties" is attested from 1889.
hyphenate these words and names
hyperventilate
hyperventilation
hypervigilance
hypha
hyphen
hyphenate
hyphenation
hypnagogic
hypno-
hypnobate
hypnopedia
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