euphoticadj.
/juːˈfəʊtɪk/ Pertaining to or designating the upper layer of the photic zone in sea-water where sufficient light penetrates to permit photosynthesis.
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the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > upper parts
oceanic1851
neritic1891
photic1903
euphotic1909
1909 E. Warming et al. Oecol. Plants iv. xxxvi. 150 Euphotic vegetation, which receives an abundance of light.
1959 New Scientist 1 Oct. 586/1 Only a relatively thin surface layer of the ocean, the ‘euphotic layer’, is illuminated, and so only in this layer can photosynthesis and primary production of organic matter take place.
1964 Oceanogr. & Marine Biol. 2 360 The observation at 70m represents the luminescent activity of euphotic zone inhabitants plus that of scattering layer organisms.
1970 Nature 25 July 375/1 The flux of organic carbon from the euphotic zone (0–100 m) into the deep sea and into the bottom sediments.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2018).
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adj.1909- in the spite of
- in the spotlight
- in the spout
- in the spud line
- in the stead
- in the stead of
- in the steel way
- in the sticks
- in the straw
- in the street
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- in the sun
- in the superficial
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- in the swing
- in the tail of
- in the tank