distortĭo, ōnis, f. [distorqueo],
a distorting , writhing , contortion : membrorum, Cic. Tusc. 4, 13, 29; cf. id. Fin. 5, 12, 35: oris, Cels. 4, 2, 2.
distortiō ōnis, f distorqueo, a distorting, contortion : membrorum. ...
An Elementary Latin Dictionary