What is phythsis?

Answer 1

Archaic term form tuberculosis:

Phthysis pumonalis;

or wasting of your eyeball!

Believe it is pronounced "tie-sis"

Answer 2

Phthisis (or pulmonary tuberculosis) is a type of lung disease caused by the bacterium Mycobacterium tuberculosis. It is characterized by symptoms such as chronic cough, weight loss, fatigue, and night sweats. Without proper treatment, phthisis can lead to severe damage to the lungs and other organs.