IDIOPATHIC
idiopathic
(adjective) (of diseases) arising from an unknown cause; “idiopathic epilepsy”
Source: WordNet® 3.1
Etymology
Adjective
idiopathic (not comparable)
(pathology) Of, relating to, or designating a disease or condition having no known cause.
Synonyms
• (pathology) essential
• (pathology) primary
• (pathology) agnogenic
Source: Wiktionary
Id`i*o*path"ic, Id`i*o*path"ic*al, a. Etym: [Cf. F. idiopathique.]
(Med.)
Definition: Pertaining to idiopathy; characterizing a disease arising
primarily, and not in consequence of some other disease or injury; --
opposed to symptomatic, sympathetic, and traumatic.
– Id`i*o*path"ic*al*ly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition