CRASIS, in Grammar, is a figure whereby two different letters are either contracted into one long letter or a diphthong. Such, e.g., is αβγ for αβγς; αδαβ for αδαβς, &c. αβγς for αβγς, &c. where α and β are contracted into αβ; and α and β into αβ; and α and β into αβ.