intumesce

In`tu*mesce", v. i. [imp. & p. p. Intumesced; p. pr. & vb. n. Intumescing.] Etym: [L. intumescere; pref. in- in + tumescere to swell up, incho. fr. tumere to swell. See Tumid.] Defn: To enlarge or expand with heat; to swell; specifically, to swell up or bubble up under the action of heat, as before the blowpipe. In a higher heat, it intumesces, and melts into a yellowish black mass. Kirwan.

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