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opisthotonos

opisthotonos Path.
  (ɒpɪsˈθɒtənɒs)
  Also -us.
  [Gr. ὀπισθότονος drawn backwards, f. opistho- + -τονος stretched, stretching, τείνειν to stretch.]
  Spasm of the muscles of the neck, back, and legs, in which the body is bent backwards; a form of tetanus.

1657 Physical Dict., Opisthotones. 1706 Phillips, Opisthotonus, a kind of Cramp or stretching of the Muscles of the Neck backwards. 1807 Med. Jrnl. XVII. 213 A universal rigidity of the dorsal muscles..with a strong retraction of the head, assuming the marks of a true opisthotonos. 1860 H. Spencer Phys. Laughter Ess. 1891 II. 460 The head is thrown back and the spine bent inwards; there is a slight degree of what medical men call opisthotonos.

Oxford English Dictionary

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