Phthisic or phthisis

[From Greek phthisikos through Latin and Old French]
  1. Pulmonary tuberculosis.
  2. Any of various lung or throat affections; a severe cough; asthma.

This term, once very common but now extremely rare, had a large number of euphonious derivatives, e.g. phthisiology, phthisiologist, phthisiophobia, phthisicky, phthisiotherapy, and phthisiotherapist. Not to be confused with phthiriasis which means an infestation with lice.