/ Dictionary / Index M mooncalf: Meaning and Definition of Find definitions for: moon•calf Pronunciation: (mn'kaf", -käf"), [key] — pl. -calves. a congenitally grossly deformed and mentally defective person. a foolish person. a person who spends time idly daydreaming. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. moonbow moonchild Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language