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

plankton

noun
 
/ˈplæŋktən/
 
/ˈplæŋktən/
 [uncountable + singular or plural verb]
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  1. the very small forms of plant and animal life that live in water
    • Plankton is/are one of the most important life forms in our oceans.
    Topics Plants and treesc2, Fish and shellfishc2
    Word Originlate 19th cent.: from German, from Greek planktos ‘wandering’, from the base of plazein ‘wander’.
See plankton in the Oxford Advanced American Dictionary
Check pronunciation: plankton

Nearby words

halfway
adverb
 
 
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