/ Dictionary / Index M mainmast: Meaning and Definition of Find definitions for: main•mast Pronunciation: (mān'mast", -mäst"Naut.mān'm&schwast), [key] — n. Naut. the second mast from forward in any ship having two or more masts, except for a yawl, ketch, or dandy. See illus. under the larger forward mast of a yawl, ketch, or dandy. the sole mast of any of various ships, as sloops or cutters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mainmast (Thesaurus) mainly main memory Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language