Meaning of mesoplankton

mes•o•plank•ton

Pronunciation: (mez"u-plangk'tun, mes"-, mē"zu-, -su-), [key]
— n.
  1. plankton that live at middle depths.
  2. planktonic organisms between 0.04 and 0.4 in. (1 mm and 1 cm) in length.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.