/ Dictionary / Index P phthisis: Meaning and Definition of Find definitions for: phthi•sis Pronunciation: (thī'sis, tī'-), [key] — n. Pathol. a wasting away. pulmonary tuberculosis; consumption. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: phthisis (Thesaurus) phthisical phugoid 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