I. noun 1. a thick piece of wood. 2. a small bar of metal for further processing. 3.
[Architecture] each of a series of short cylindrical pieces inserted at intervals in Norman decorative mouldings.
[Heraldry] a rectangle placed vertically as a charge.
– origin late Middle English: from Old French billette and billot, diminutives of bille ‘tree trunk’, from medieval Latin billa, billus ‘branch, trunk’, probably of Celtic origin.