In'tu-mĕsçe', v. i.

(ĭn/tu-mĕs'), v. i. [imp. & p. p. IN-TUMESCED (ĭn/tu-mĕst'); p. pr. & vb. n. INTU-MESCING.] [Lat. intumescere, from prefix in and tumescere, to swell up, v. inchoative from tumere, to swell, to be swollen.] To enlarge or expand with heat; to swell.

In a higher heat, it intumesces, and melts into a yellowish-black mass. Kirwan.