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“scotophile”
scotophile, skotophile
An organism that requires or has an affinity for darkness.
The measurement of the length of the day or the night was accomplished by an endogenous, or built-in, daily rhythm that consisted of two half-cycles, one photophilic, "light-loving" and the other scotophilic, "dark loving".
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scot-, scoto-, skot-, skoto- +
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