Burglar, n.
Etymology: [OE. burg town, F. bourg, fr. LL. burgus (of German origin) + OF. lere thief, fr. L. latro. See Borough, and Larceny.]
(Law)
One guilty of the crime of burglary. Burglar alarm, a device for giving alarm if a door or window is opened from without.
Shades of meaning
Fernald has no entry of its own for burglar; he lists it under robber.
He lists it without comment; the entries above explain its neighbors.