/ Dictionary / Index N nemathecium: Meaning and Definition of Find definitions for: nem•a•the•ci•um Pronunciation: (nem"u-thē'shē-um, -sē-um), [key] — pl. -ci•a a wartlike protuberance on the thallus of certain red algae, containing tetraspores, antheridia, or cystocarps. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nemat- nemathelminth Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language