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paroxysm (n.)

early 15c., "sudden attack, convulsion; periodic worsening of a disease," from Old French paroxysme, paroxime (13c.) and directly from Medieval Latin paroxysmus "irritation, fit of a disease," from Greek paroxysmos "irritation, exasperation," from paroxynein "to irritate, goad, provoke," from para- "beyond" (see para- (1)) + oxynein "sharpen, goad," from oxys "sharp, pointed" (from PIE root *ak- "be sharp, rise (out) to a point, pierce" ). Non-medical sense of "any sudden and violent action; convulsion, fit" is by c. 1600. Related: Paroxysmal.

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Definitions of paroxysm from WordNet

paroxysm (n.)
a sudden uncontrollable attack;
a paroxysm of giggling
Synonyms: fit / convulsion
From wordnet.princeton.edu