/ Dictionary / Index M Martello tower: Meaning and Definition of Find definitions for: Mar•tel'lo tow"er Pronunciation: (mär-tel'ō), [key] — Fort. Fort. a circular, towerlike fort with guns on the top. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. martellato martempering Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language