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English word euphotic comes from English photic, English eu- (Good, well. True, genuine.)
photic (English)
Of, related to, or irradiated by light; especially describing that part of the near-surface ocean is which photosynthesis is possible.
eu- (English)
Good, well. True, genuine.
euphotic (English)
Describing that part of the near-surface ocean in which photosynthesis is possible.