Emily Dickinson Lexicon

CRA'SIS, n. [Gr. κρασις, from κεραννυμι, or κεραω, to mix, to temper.]

1. The temper or healthy constitution of the blood in an animal body; the temperament which forms a particular constitution of the blood. – Coxe.
2. In grammar, a figure by which two different letters are contracted into one long letter or into a diphthong; as, αληθεα into αληθη; τυχεος into τυχους.