noun, feminine/kʁa/plural: crases
crase is feminine in French.
crasis (contraction of a vowel at the end of a word with the start of the next word), (especially) in Ancient Greek
“La crase est très employée dans la conversation courante populaire.” — Crasis is very often employed in modern colloquial conversation.
Synonyms: agglutination, pompion
Related: crasiographie, crasiologie, crasioristique
From Ancient Greek κρᾶσις (krâsis, “mixture”).