This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The act or process of swelling or the condition of being swollen.

n. A swollen organ or body part.

n. the process of swelling up or the condition of being swollen

n. an instance of such swelling

n. The act or process of swelling or enlarging; also, the state of being swollen; expansion; tumidity; especially, the swelling up of bodies under the action of heat.

n. Anything swollen or enlarged, as a tumor.

n. The state or process of swelling or enlarging, as with heat; expansion; tumidity.

n. A swollen or tumid growth or mass; tumefaction.

n. swelling up with blood or other fluids (as with congestion)

n. the increase in volume of certain substances when they are heated (often accompanied by release of water)

"British America and the north of the United States, this phenomenon is explained by the flat conformation of the territories bordering on the pole, and on which there is no intumescence of the soil to oppose any obstacle to the north winds; here, in Lincoln Island, this explanation would not suffice."

chemical change    chemical process    chemical action   

intumescent   

expansion    tumidity   

ennoblement    volatilization    curettage    compressibility    effacement