/ Dictionary / Index P phthisical: Meaning and Definition of Find definitions for: phthis•i•cal Pronunciation: (tiz'i-kul, thiz'-), [key] — adj. pertaining to, of the nature of, or affected by phthisis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phthisic phthisis 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