/ Dictionary / Index S seasickness: Meaning and Definition of Find definitions for: sea•sick•ness Pronunciation: (sē'sik"nis), [key] — n. nausea and dizziness, sometimes accompanied by vomiting, resulting from the rocking or swaying motion of a vessel in which one is traveling at sea. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seasickness (Thesaurus) seasick seaside Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language