/ Dictionary / Index M Macleod: Meaning and Definition of Find definitions for: Mac•leod Pronunciation: (mu-kloud'), [key] — n. See 1876–1935, Scottish physiologist: one of the discoverers of insulin; Nobel prize for medicine 1923. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: macleod (Thesaurus) MacLennan MacMahon Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language