Webster's Revised Unabridged Dictionary · 1913

Idiopathy

Idiopathy , noun

[Greek {not transcribed}; 'i`dios proper, peculiar + {not transcribed}, {not transcribed}, to suffer: compare French 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.
(Medicine) A morbid state or condition not preceded or occasioned by any other disease; a primary disease.