How do you spell Throe

Available Definitions:
1)  n. - Extreme pain; violent pang; anguish; agony; especially, one of the pangs of travail in childbirth, or purturition.
2)  n. - A tool for splitting wood into shingles; a frow.
3)  v. i. - To struggle in extreme pain; to be in agony; to agonize.
4)  v. t. - To put in agony.