|Noah Webster's Dictionary|
(p. pr. & vb. n.) of Convulse.
Int. Standard Bible Encyclopedia
kon-vuls'-ing (Mark 1:26 margin (the King James Version torn)).
See UNCLEAN SPIRIT.
Convulsing (2 Occurrences)
Mark 1:26 The unclean spirit, convulsing him and crying with a loud voice, came out of him. (WEB RSV)
Mark 9:26 Having cried out, and convulsed greatly, it came out of him. The boy became like one dead; so much that most of them said, "He is dead." (See RSV)