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mesoplankton

[mez-uh-plangk-tuh n, mes-, mee-zuh-, -suh-]
noun
  1. plankton that live at middle depths.
  2. planktonic organisms between 0.04 and 0.4 inches (1 mm and 1 cm) in length.
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Origin of mesoplankton

First recorded in 1895–1900; meso- + plankton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018