aphotic (adj.) Look up aphotic at Dictionary.com
"untouched by sunlight, lightless" (in reference to deep-sea regions), 1903, Modern Latin, from Greek a- "not, without" (see a- (3)) + phos (genitive photos) "light" (from PIE root *bha- (1) "to shine") + -ic. Aphotic zone is recorded from 1913.