the smallest of the microplankton; the aquatic organisms that can pass through fine mesh plankton nets.
Origin of nannoplankton
1910–15; nanno- + plankton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Plankton of minute size, especially plankton composed of organisms measuring from 2 to 20 micrometers.
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