Etymology
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tumefaction (n.)

"morbid swelling," early 15c., from Medieval Latin tumefaccionem (nominative tumefaccio), noun of action from Latin tumefactus, from tumescere "begin to swell, swell up" (see tumescence).

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Definitions of tumefaction

tumefaction (n.)
the process of tumefying; the organic process whereby tissue becomes swollen by the accumulation of fluid within it;
From wordnet.princeton.edu