/ Dictionary / Index M mammilla: Meaning and Definition of Find definitions for: mam•mil•la Pronunciation: (ma-mil'u), [key] — pl. -mil•lae the nipple of the mamma, or breast. any nipplelike process or protuberance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mammilla (Thesaurus) mammiferous mammillaria Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language