noun
or syn·aer·e·sis sə̇ˈnerəsə̇s, -nir-, esp in sense 2 ÷ˌsinəˈrēsə̇s
( plural synere·ses or synaere·ses -əˌsēz, -ēˌsēz)
Etymology: Late Latin synaeresis, from Greek synairesis, literally, contraction, from synairein to seize and bring together, shorten, contract (from syn- + hairein to seize, take) + -sis — more at heresy
1.
a. : the union or drawing together into one syllable of two vowels ordinarily separated in pronunciation (as ˈsēst for ˈsē.ə̇st seest ) — opposed to diaeresis
b. : synizesis 1
2. : the separation of liquid from a gel caused by contraction
syneresis if carried further … results in coagulation — J.W.McBain
— compare coagulation 1, imbibition 2a