exacerbescence

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]