the smallest of the microplankton; the aquatic organisms that can pass through fine mesh plankton nets.

1910–15; nanno- + plankton Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
There has been no attempt made to identify or to count nannoplankton, zooplankton or benthic algae.
Some phytoplankton, called nannoplankton, are extremely small.
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