/ Dictionary / Index C clapper rail: Meaning and Definition of Find definitions for: clap'per rail" Pronunciation: [key] a long-billed rail, Rallus longirostris, of coastal marshes of the Americas, having a harsh, cackling cry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. clapper clapt Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language