/ Dictionary / Index S seiner: Meaning and Definition of Find definitions for: sein•er Pronunciation: (sā'nur), [key] — n. a person who fishes with a seine. a boat used in fishing with a seine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seine-Maritime Seine-St-Denis Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language