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Answer for the clue "Severe spasm in which the back arches and the head bends back and heels flex toward the back ", 12 letters:
opisthotonos

Word definitions for opisthotonos in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context medicine English) A tetanic spasm in which the body is bent backwards and stiffened.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Opisthotonos \Op`is*thot"o*nos\, n. [NL., from Gr. ? backwards + ? a stretching.] (Med.) A tetanic spasm in which the body is bent backwards and stiffened.

WordNet Word definitions in WordNet
n. severe spasm in which the back arches and the head bends back and heels flex toward the back