Pronunciation: (spaz'um), [key]
1. Pathol.a sudden, abnormal, involuntary muscular contraction, consisting of a continued muscular contraction (tonic spasm) or of a series of alternating muscular contractions and relaxations (clonic spasm).
2. any sudden, brief spell of great energy, activity, feeling, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.