< b>Fear of the dark: Pathological fear of the dark, an abnormal and persistent
dread of the dark. Sufferers experience undue anxiety even though they may rationally
realize that the dark does not pose a threat commensurate with their fear.
Fear of the dark is termed "nyctophobia," a word derived from the Greek "nyx"
(night) and the Greek "phobos" (fear). "Nyx" has also contributed to other medical
terms such as "nyctalopia" (night blindness) and "nyctanopia" (impaired vision in
dim light and in the dark). Another term for fear of the dark is scotophobia.
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