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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浮游生物Topics Plants and treesc2, Fish and shellfishc2
    Word Originlate 19th cent.: from German, from Greek planktos ‘wandering’, from the base of plazein ‘wander’.