World English Dictionary
nanoplankton or nannoplankton (ˈnænəʊˌplæŋktən)
microscopic organisms in plankton
nannoplankton or nannoplankton

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
nannoplankton also nanoplankton   (nān'ə-plāngk'tən)  Pronunciation Key 
Plankton of minute size, especially plankton composed of organisms measuring from 2 to 20 micrometers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are part of the so-called nanoplankton and play critical roles in the ocean food chain.
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