The Collaborative International Dictionary
Exacerbescence
Exacerbescence \Ex*ac`er*bes"cence\ ([e^]gz*[a^]s`[~e]r*b[e^]s"sens), n. [L. exacerbescens, -entis, p. pr. of exacerbescere, incho. of exacerbare.] Increase of irritation or violence, particularly the increase of a fever or disease.
Wiktionary
exacerbescence
n. (context archaic English) increase of irritation or violence, particularly the increase of a fever or disease