microplankton

[mahy-kroh-plangk-tuh n]

noun

plankton visible as individual organisms only with the aid of a microscope, which excludes most animal plankton.

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. 2019