The Collaborative International Dictionary of English v.0.48:

Eclampsia \Ec*lamp"si*a\, n. [NL., from Gr. ? a shining forth,
   fr. ? to shine forth; ? out + ? to shine.] (Med.)
   A fancied perception of flashes of light, a symptom of
   epilepsy; hence, epilepsy itself; convulsions.
   [1913 Webster]

   Note: The term is generally restricted to a convulsive
         affection attending pregnancy and parturition, and to
         infantile convulsions.
         [1913 Webster]

WordNet (r) 3.0 (2006):

eclampsia
    n 1: a toxic condition characterized by convulsions and possibly
         coma during or immediately after pregnancy

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "eclampsia":
   Jacksonian epilepsy, Rolandic epilepsy, abdominal epilepsy, access,
   acquired epilepsy, activated epilepsy, affect epilepsy,
   akinetic epilepsy, apoplexy, arrest, attack, autonomic epilepsy,
   blockage, cardiac epilepsy, clonic spasm, clonus, convulsion,
   cortical epilepsy, cramp, cursive epilepsy, diurnal epilepsy,
   epilepsia, epilepsia gravior, epilepsia major, epilepsia minor,
   epilepsia mitior, epilepsia nutans, epilepsia tarda, epilepsy,
   epitasis, falling sickness, fit, focal epilepsy, frenzy, grand mal,
   grip, haute mal, hysterical epilepsy, ictus, larval epilepsy,
   laryngeal epilepsy, laryngospasm, latent epilepsy, lockjaw,
   matutinal epilepsy, menstrual epilepsy, musicogenic epilepsy,
   myoclonous epilepsy, nocturnal epilepsy, occlusion, orgasm,
   paroxysm, petit mal, physiologic epilepsy, psychic epilepsy,
   psychomotor epilepsy, reflex epilepsy, rotatoria, seizure,
   sensory epilepsy, serial epilepsy, sexual climax, spasm, stoppage,
   stroke, tardy epilepsy, tetanus, tetany, throes, thromboembolism,
   thrombosis, tonic epilepsy, tonic spasm, torsion spasm,
   traumatic epilepsy, trismus, ucinate epilepsy, visitation