mesoplankton

[ mez-uh-plangk-tuhn, mes-, mee-zuh-, -suh- ]
/ ˌmɛz əˈplæŋk tən, ˌmɛs-, ˌmi zə-, -sə- /

noun

plankton that live at middle depths.
planktonic organisms between 0.04 and 0.4 inch (1 millimeter and 1 centimeter) in length.

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disgruntle

Origin of mesoplankton

First recorded in 1895–1900; meso- + plankton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020