| 1. | a wasting away. |
| 2. | pulmonary tuberculosis; consumption. |

phthisis phthi·sis (thī'sĭs, tī'-) or phthis·ic (tĭz'ĭk, thĭz'-)
n.
A disease characterized by the wasting away or atrophy of the body or a part of the body.
Tuberculosis of the lungs. No longer in technical use.