/ Dictionary / Index H hemiplankton: Meaning and Definition of Find definitions for: hem•i•plank•ton Pronunciation: (hem"i-plangk'tun), [key] — n. plankton that spend part of their life cycle in a vegetative state on the sea bottom, riverbed, etc. (opposed to holoplankton). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hemiparesis hemiplegia Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language