Crasis
Crasis (kr?"s?s) , noun
[Late Latin, temperament, from Greek {not transcribed}, from {not transcribed} to mix.]
1.
(Medicine) A mixture of constituents, as of the blood; constitution; temperament.
2.
(Grammar) A contraction of two vowels (as the final and initial vowels of united words) into one long vowel, or into a diphthong; synaresis; as, cogo for coago.