CRASIS, noun [Gr., 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. 2. In grammar, a figure by which two different letters are contracted into one long letter or into a diphthong.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI