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microplankton

[mahy-kroh-plangk-tuh n]
noun
  1. plankton visible as individual organisms only with the aid of a microscope, which excludes most animal plankton.
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Compare nannoplankton.

Origin of microplankton

First recorded in 1900–05; micro- + plankton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018