boyau /bwoˈyō, bwäˈyō or boiˈō/ (fortification)

A communication trench

• reclimbs
• reclinable
• reclinate
• nine-inch
• nine men's morris
• nine-metre
• nine-mile
• ninepence
• ninepences
• ninepennies
• ninepenny
• ninepenny marl
• ninepenny morris
• ninepin
• ninepins
• nine points of the law
• nines
• ninescore
• ninescores
• nineteen
• nineteens
• nineteenth
• nineteenth hole
• nineteenthly
• nineteenth man