/ Dictionary / Index C Casco Bay: Meaning and Definition of Find definitions for: Cas'co Bay' Pronunciation: (kas'kō), [key] a bay in SW Maine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cascarilla case Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language