Source : Webster's Revised Unabridged Dictionary (1913)

Spasmodic \Spas*mod"ic\, n. (Med.)
   A medicine for spasm.

Spasmodic \Spas"mod"ic\, a. [Gr. ?; ? a convulsion + ? likeness:
   cf. F. spasmotique.]
   1. (Med.) Of or pertaining to spasm; consisting in spasm;
      occuring in, or characterized by, spasms; as, a spasmodic
      asthma.

   2. Soon relaxed or exhausted; convulsive; intermittent; as,
      spasmodic zeal or industry.

   {Spasmodic croup} (Med.), an affection of childhood
      characterized by a stoppage of brathing developed suddenly
      and without fever, and produced by spasmodic contraction
      of the vocal cords. It is sometimes fatal. Called also
      {laryngismus stridulus}, and {childcrowing}.

   {Spasmodic stricture}, a stricture caused by muscular spasm
      without structural change. See {Organic stricture}, under
      {Organic}.

Source : WordNet®

spasmodic
     adj 1: affected by involuntary jerky muscular contractions;
            resembling a spasm; "convulsive motions"; "his body
            made a spasmodic jerk"; "spastic movements" [syn: {convulsive},
             {spastic}]
     2: occurring in spells and often abruptly; "fitful bursts of
        energy"; "spasmodic rifle fire" [syn: {fitful}]