/ Dictionary / Index M macrocyst: Meaning and Definition of Find definitions for: mac•ro•cyst Pronunciation: (mak'ru-sist"), [key] — n. Mycol. a large cyst or spore case, esp. the encysted, resting plasmodium of a slime mold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. macrocyclic macrocyte Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language