Illness of unknown origin

• Any disease of unknown cause

Wiktionary Word definitions in Wiktionary
n. Something idiopathic; a disease having no known cause.

WordNet Word definitions in WordNet
n. any disease arising from internal dysfunctions of unknown cause [syn: idiopathic disease , idiopathic disorder ]

Wikipedia Word definitions in Wikipedia
An idiopathy is any disease with unknown pathogenesis or apparently spontaneous origin. From Greek ἴδιος idios "one's own" and πάθος pathos "suffering", idiopathy means approximately "a disease of its own kind". For some medical conditions, one or more ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Idiopathy \Id`i*op"a*thy\, n.; pl. Idiopathies . [Gr. ?; 'i`dios proper, peculiar + ?, ?, to suffer: cf. F. idiopathie.] A peculiar, or individual, characteristic or affection. All men are so full of their own fancies and idiopathies, that they scarce ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1640s, Modern Latin, from Greek idiopatheia , from comb. form of idios "one's own" (see idiom ) + -patheia , comb. form of pathos "suffering, disease, feeling" (see pathos ). Related: idiopathic .