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[krey-sis] /ˈkreɪ sɪs/
noun, plural crases
[krey-seez] /ˈkreɪ siz/ (Show IPA).
composition; constitution; makeup.
1595-1605; < Greek krâsis mixture, blend, equivalent to krā- (base of kerannýnai to mix) + -sis -sis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for crasis


noun (pl) -ses (-siːz)
the fusion or contraction of two adjacent vowels into one Also called syneresis
Word Origin
C17: from Greek krasis a mingling, from kerannunai to mix
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for crasis

in classical Greek, the contraction of two vowels or diphthongs at the end of one word and the beginning of an immediately following word, as kan for kai an or houmos for ho emos. Crasis is especially common in some lyric poetry and in Old Comedy. The term sometimes refers to word-internal contraction in Latin, as nil from nihil. The word is from the Greek krasis, literally, "mixing or blending."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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