Synaeresis definitions

sĭ-nĕr'ĭ-sĭs
(linguistics, prosody) The contraction of two vowels into a diphthong or a long vowel.
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(chemistry) The separating out of the liquid from a gel.
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Origin of synaeresis

From Ancient Greek συναίρεσις (sunairesis, “unification"), from συν (sun, “together") + αἵρεσις (airesis, “taking"), from αἱρέω (aireō, “I take").