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Meaning of holoplankton

hol•o•plank•ton

Pronunciation: (hol"u-plangk'tun, hō"lu-), [key]
— n.
  1. plankton that spend their entire life cycle as free-swimming organisms (opposed to hemiplankton).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.