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mesoplankton

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

noun

  1. plankton that live at middle depths.

  2. planktonic organisms between 0.04 and 0.4 inch (1 millimeter and 1 centimeter) in length.

Etymology

Origin of mesoplankton

First recorded in 1895–1900; meso- + plankton

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.