/ Dictionary / Index M monorchidism: Meaning and Definition of Find definitions for: mo•nor•chid•ism Pronunciation: (mu-nôr'ki-diz"um), [key] a prenatal or postnatal condition in which one testis is absent or has not descended into the scrotum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monorchidism (Thesaurus) monorchid monorhinous Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language