"one who commits robbery by breaking into a house," 1540s, shortened from Anglo-Latin burglator (late 13c.), earlier burgator, from Medieval Latin burgator "burglar," from burgare "to break open, commit burglary," from Latin burgus "fortress, castle," a Germanic loan-word akin to borough.
The unetymological -l- is perhaps from influence of Latin latro "thief" (see larceny). Middle English had burgur (c. 1200), from Old French burgeor, burgur, also housbreker (c. 1400). Burglar-alarm is by 1840.
1865, American English, from burglary + -ize. Damned as an American barbarism in England and Canada. Related: Burglarized; burglarizing.
We see in a telegraphic despatch from across the boundary line that a store was "burglarized" a short time ago. We are sorry that any thing so dreadful should have happened to any of our inventive cousins. Truly the American language is "fearfully and wonderfully made." [Upper Canada Law Journal, September 1865, p.228]
Burglarize, to, a term creeping into journalism. "The Yankeeisms donated, collided, and burglarized have been badly used up by an English magazine writer." (Southern Magazine, April, 1871.) The word has a dangerous rival in the shorter burgle. [Maximilian Schele De Vere, "Americanisms; The English of the New World," 1872]