hallow (v.) Look up hallow at Dictionary.com
Old English halgian "to make holy, sanctify; to honor as holy, consecrate, ordain," related to halig "holy," from Proto-Germanic *hailagon (cognates: Old Saxon helagon, Middle Dutch heligen, Old Norse helga), from PIE root *kailo- "whole, uninjured, of good omen" (see health). Used in Christian translations to render Latin sanctificare. Related: Hallowed; hallowing.
hallow (n.) Look up hallow at Dictionary.com
"holy person, saint," Old English haliga, halga, from hallow (v.). Obsolete except in Halloween.