plankton
noun /ˈplæŋktən/
/ˈplæŋktən/
[uncountable + singular or plural verb]- the very small forms of plant and animal life that live in waterTopics Plants and treesc2, Fish and shellfishc2Word Originlate 19th cent.: from German, from Greek planktos ‘wandering’, from the base of plazein ‘wander’.