The Collaborative International Dictionary
Convalescency
Convalescence \Con`va*les"cence\, Convalescency \Con`va*les"cen*cy\, n. [L. convalescentia: cf. F. convalescence.] The recovery of heath and strength after disease; the state of a body renewing its vigor after sickness or weakness; the time between the subsidence of a disease and complete restoration to health.
Wiktionary
convalescency
n. (dated form of convalescence English)