An irrational fear of dawn or of the light of dawn; a psychiatric condition involving anxiety about early morning or daybreak.
From Greek 'eos' (dawn) plus 'phobos' (fear), literally meaning 'fear of dawn'; a rare phobia term formed according to standard psychiatric naming conventions.
While eosophobia is technically in the dictionary, it's so rare that most psychiatrists have never encountered a patient with this specific fear—it's one of those words that exists more in medical word-games than in actual clinical practice.
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