Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
torsĭo, ōnis, f. [torqueo], a wringing or griping: ventris, Hier. in Isa. 6, 13, 8; plur.: torsiones et dolores, torments, Vulg. lsa. 13, 8.