Webster’s Revised Unabridged Dictionary · 1913
Idiosyncrasy
Id′i·o·syn′cra·sy (·sĭn̲′krȧ·sy̆), n.; pl. Idiosyncrasies (#). [Gr. ἰδιοσυγκρασία; ἴδιος proper, peculiar + σύγκρασις a mixing together, fr. συγκεραννύναι to mix together; σύν with + κεραννύναι 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.