/ Dictionary / Index M milium: Meaning and Definition of Find definitions for: mil•i•um Pronunciation: (mil'ē-um), [key] — pl. mil•i•a a small white or yellowish nodule resembling a millet seed, produced in the skin by the retention of sebaceous secretion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: milium (Thesaurus) militiaman milk Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language