crasis
/ˈkreɪsɪs/noun
(pl. crases /-siːz/)
- a contraction of two adjacent vowels into one long vowel or diphthong, for example the reduction of words in ancient Greek from three syllables to two融接（语音）, 异词元音结合。
词源
mid 16th cent. (as a medical term denoting the blending of physical qualities giving rise to a particular state of health)：from Greek krasis 'mixture'.