extumescence

from The Collaborative International Dictionary of English v.0.48

Extumescence \Ex`tu*mes"cence\, n. [L. ex. + tumescens, p. pr.
   of tumescere, incho. fr. tumere to swell: cf. F.
   extumescence.]
   A swelling or rising. [R.] --Cotgrave.
   [1913 Webster]