Definition of plankton noun from the Oxford Advanced Learner's Dictionary

 

plankton

 noun
noun
BrE BrE//ˈplæŋktən//
 
; NAmE NAmE//ˈplæŋktən//
 
[uncountable + singular or plural verb]
 
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the very small forms of plant and animal life that live in water Word Origin late 19th cent.: from German, from Greek planktos ‘wandering’, from the base of plazein ‘wander’.
See the Oxford Advanced American Dictionary entry: plankton