phthisis
Concise Oxford English Dictionary © 2008 Oxford University Press:
phthisis /ˈ(f)θʌɪsɪs, ˈtʌɪ-/
▶noun archaic pulmonary tuberculosis or a similar progressive wasting disease.
– derivatives
phthisic adjective,
phthisical adjective.
phthisic adjective,
phthisical adjective.
– origin C16: via L. from Gk, from phthinein ‘to decay’.
'phthisis' also found in these Oxford entries:

