phthisic /ˈ(f)θɪzɪk/noun 4adjective 1forms 1 noun4 •A wasting illness of the lungs, such as asthma or tuberculosis; consumption; phthisis. •Any wasting disease. •Any wasting or shrinking of another body part such as, for example, the eye (phthisis bulbi). •A person suffering from phthisis. adjective1 •Of or relating to phthisis or tuberculosis; tubercular; consumptive. formsphthisics