Webster’s Revised Unabridged Dictionary · 1913
Idiopathy
Id′i·op′a·thy (ĭd′ĭ·ŏp′ȧ·thy̆), n.; pl. Idiopathies (#). [Gr. ἰδιοπάθεια; ἴδιος proper, peculiar + παθεῖν, πάσχειν, to suffer: cf. F. idiopathie.] 1. A peculiar, or individual, characteristic or affection.
All men are so full of their own fancies and idiopathies, that they scarce have the civility to interchange any words with a stranger. Dr. H. More.
2. (Med.) A morbid state or condition not preceded or occasioned by any other disease; a primary disease.