Boulevard \Bou"le*vard`\, n. [F. boulevard, boulevart, fr. G. bollwerk. See Bulwark.]

1. Originally, a bulwark or rampart of fortification or fortified town.

2. A public walk or street occupying the site of demolished fortifications. Hence: A broad avenue in or around a city.

Source: Webster's Revised Unabridged Dictionary (1913)