aphotic

adjective
apho·​tic | \ (ˌ)ā-ˈfō-tik How to pronounce aphotic (audio) \

Definition of aphotic

: being the deep zone of an ocean or lake receiving too little light to permit photosynthesis

First Known Use of aphotic

1894, in the meaning defined above

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The first known use of aphotic was in 1894

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