noun / adjective
flagellant
FLAJ-uh-lunt/ˈflædʒələnt/
A person who practices self-whipping.
The flagellant whips himself as an act of religious penance.

Etymology
Latin flagellum, “whip,” underlies a verb meaning “to scourge”; its participle describes someone whipping. In the religious sense, the action becomes self-directed as a form of discipline.
More examples
- Some flagellants practice self-whipping in private.
- The book describes flagellant rituals in a medieval community.
- Not every flagellant practices self-whipping for religious reasons.
Forms
flagellant · flagellants
flagellate verb — To whip oneself or another person.
flagellation noun — Whipping oneself or another person.