Etymology
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intumescence (n.)

"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" (from PIE root *en "in") + tumescere "begin to swell, swell up," figuratively "grow excited, become enraged," inceptive of tumere "to swell" (from PIE root *teue- "to swell"), with inchoative suffix -escere.

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Definitions of intumescence

intumescence (n.)
swelling up with blood or other fluids (as with congestion);
Synonyms: intumescency
intumescence (n.)
the increase in volume of certain substances when they are heated (often accompanied by release of water);
Synonyms: intumescency / swelling
From wordnet.princeton.edu