(pathology, formerly) Any wasting disease.
A person suffering from phthisis.
Any wasting or shrinking of another body part such as, for example, the eye (phthisis bulbi).
Origin of phthisic
- Middle English ptisike from Old French ptisique from phthisicus consumptive from Greek phthisikos from phthisis wasting away, consumption phthisis
From American Heritage Dictionary of the English Language, 5th Edition