1 an uncontrollable outburst
a paroxysm of giggling
a a sudden attack or recurrence of a disease
b any fit or convulsion
(C17: via French from Medieval Latin paroxysmus annoyance, from Greek paroxusmos, from paroxunein to goad, from para-1 (intensifier) + oxunein to sharpen, from oxus sharp)
paroxysmal, paroxysmic adj
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"