euplankton

euplankton Either consisting entirely of free-floating organisms or open water plankton as distinct from tychoplankton. Inter-related cross references, directly or indirectly, involving the 'sea' and the 'ocean' bodies of water: abysso- (bottomless); Atlantic; batho-, bathy- (depth); bentho...
Found on http://www.wordinfo.info/words/index/info/view_unit/2620/
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