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Meaning of microplankton

mi•cro•plank•ton

Pronunciation: (mī"krō-plangk'tun), [key]
— n.
  1. plankton visible as individual organisms only with the aid of a microscope, which excludes most animal plankton. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.