Idiosýncrasy. n.s. [idiosynacrase, Fr. ἴδιος, σύν, and κρᾶσις.] A peculiar temper or disposition not common to another. Qui.
Whether quails, from any idiosyncrasy or peculiarity of constitution, do innocuously feed upon hellebore, or rather sometimes but medicinally use the same. Brown's Vulg. Errours.
The understanding also hath its idiosyncrasies, as well as other faculties. Glanv. Sceps. c. 15.