idiopathy, n. [Gr. ; 'i`dios proper, peculiar + , , to suffer: cf. F. idiopathie.].
A peculiar, or individual, characteristic or affection. [1913 Webster]
"All men are so full of their own fancies and idiopathies, that they scarce have the civility to interchange any words with a stranger."
[1913 Webster]
A morbid state or condition not preceded or occasioned by any other disease; a primary disease. [1913 Webster]