seizure /sē′ zh ​ ​ r/ [Fr, saisir, to seize],

A hyper excitation of neurons in the brain leading to abnormal electric activity that causes a sudden, violent involuntary series of contractions of a group of muscles. It may be paroxysmal and episodic, as in a seizure disorder, or transient and acute, as after a head concussion. A seizure may be clonic or tonic; focal, unilateral, or bilateral; generalized or partial.

© Matt Dillard 2012