The Collaborative International Dictionary of English v.0.48:
Aphotic \A*pho"tic\ ([.a]*f[=o]"t[i^]k), a. [Gr. 'a`fws, 'a`fwtos.] Without light. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
aphotic adj 1: lacking light; especially not reached by sunlight; "the aphotic depths of the sea where no photosynthesis occurs"