Noun
A tetanic spasm in which the body is bent backwards and stiffened.
Source: Webster's dictionaryThe characteristic position is called "stargazing", meaning a chick "sitting on its hocks and the head in opisthotonos ". Source: Internet
In cattle, constant changing of position of the feet gives bluetongue the nickname The Dancing Disease. citation Torsion of the neck ( opisthotonos or torticollis ) is observed in severely affected animals. Source: Internet