intumescence (n.) Look up intumescence at Dictionary.com
"swollen state, expansion," 1650s, from French intumescence (17c.), from Latin intumescere "to swell up, rise, be elevated," of sounds, "grow louder," figuratively, "grow excited, become enraged," from in- "in" (see in- (2)) + tumescere "begin to swell, swell up" (see tumescence).