/ Dictionary / Index A anal fin: Meaning and Definition of Find definitions for: a'nal fin' Pronunciation: [key] the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. analeptic analgesia Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language