• Webster's Revised Unabridged Dictionary
    • n Convulsionist One who has convulsions; esp., one of a body of fanatics in France, early in the eighteenth century, who went into convulsions under the influence of religious emotion; as, the Convulsionists of St. M├ędard.
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Century Dictionary and Cyclopedia
    • n convulsionist A eonvulsionary.
    • n convulsionist In geology, a catastrophist.
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In literature:

But the convulsionist only laughs at his idle efforts.
"The Atlantic Monthly, Vol. 13, No. 76, February, 1864" by Various
Most of the convulsionists, however, have not these ecstasies so strongly marked.
"The Atlantic Monthly, Volume 13, No. 77, March, 1864" by Various