Pyro is a combining of the forms of pyro and pyr 'fire'. Pyre which is a name for a pile or heap of wood or other combustible material. Medieval Latin Pyra circa 1650-60 CE. Latin pyra, Greek pyrá...
The word penitentiary is from the word penitent, which means someone who feels regret: a sinner or wrongdoer who feels regret or sorrow for misdeeds; someone who does a penance as directed by a...