Idiosyncrasy

Id`i*o*syn"cra*sy (?), n.; pl. Idiosyncrasies (#). [Gr. ?; 'i`dios proper, peculiar + ? a mixing together, fr. ? to mix together; ? with + ? to mix: cf. F. idiosyncrasie. See Idiom, and Crasis.] A peculiarity of physical or mental constitution or temperament; a characteristic belonging to, and distinguishing, an individual; characteristic susceptibility; idiocrasy; eccentricity.

The individual mind . . . takes its tone from the idiosyncrasies of the body.
I. Taylor.