pertaining to or of the nature of a spasm; characterized by spasms.
resembling a spasm or spasms; sudden but brief; sporadic: spasmodic efforts at reform.
given to or characterized by bursts of excitement.
Also, spasmodical.

1675–85; < Medieval Latin spasmodicus < Greek spasmṓd(ēs) spasmodic (derivative of spasmós spasm; see -ode1) + Latin -icus -ic

spasmodically, adverb
antispasmodic, adjective, noun
postspasmodic, adjective
unspasmodic, adjective
unspasmodical, adjective
unspasmodically, adverb

2. occasional, intermittent, periodic, fleeting. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spasmodic or spasmodical (spæzˈmɒdɪk)
1.  taking place in sudden brief spells
2.  of or characterized by spasms
[C17: New Latin, from Greek spasmosspasm]
spasmodical or spasmodical
[C17: New Latin, from Greek spasmosspasm]
spas'modically or spasmodical

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1681, from M.L. spasmodicus, from Gk. spasmodes "of the nature of a spasm," from spasmos (see spasm) + -odes "like."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

spasmodic spas·mod·ic (spāz-mŏd'ĭk)

  1. Relating to, affected by, or having the character of a spasm; convulsive.

  2. Happening intermittently; fitful.

  3. Given to sudden outbursts of energy or of feeling; excitable.

spas·mod'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sneeze: to make a sudden violent spasmodic audible expiration of breath through
  the nose and mouth, especially as a reflex act.
The movie offers a grab bag of oddball characters who seem unfocused, and its
  visual rhythms are jerky and spasmodic.
Sidling up to the animal, a flirtatious grin on his face, he falls into a
  spasmodic goat dance.
The music is helpful but the spasmodic sounds are quite unnecessary.
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