Etymology
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tumescent (adj.)

1806, from Latin tumescentem (nominative tumescens), present participle of tumescere "to 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 tumescent

tumescent (adj.)
abnormally distended especially by fluids or gas;
tumescent tissue
Synonyms: puffy / intumescent / tumid / turgid
From wordnet.princeton.edu