burglar

The word 'burglar' entered English in the 16th century from the Anglo-Latin 'burglator', a legal term for a specific type of thief. This Latin term itself was likely influenced by the earlier Old French 'burgler' or 'burgleor', meaning 'one who robs a house'. The ultimate root is the Late Latin 'burgus', meaning 'fortress' or 'walled town', which was borrowed from the Proto-Germanic 'burgz' (a fortified place, hill-fort). The semantic journey is clear: from a fortified place ('burg'), to the act of breaking into a secure dwelling ('burglary'), and finally to the person who commits that act ('burglar'). This evolution reflects the legal and social need to define a crime distinct from general theft.

The word 'burglar' is a simplex loanword from Anglo-Latin. It does not contain separable, productive morphemes in modern English. The final '-ar' resembles an agent-noun suffix (like in 'liar', 'beggar'), but 'burgl-' is not a free-standing root.