1. Not allowing air or gas to pass in or out
   - airtight, air-tight

See also: tight

• blusterer
• blustering
• blusterous
• blustery
• Blériot
• bm
• BMDO
• BMI
• BMR
• BMus
• bn
• BNP
• BNS
• Bo Hai
• bo tree
• bo's'n
• boa
• boa constrictor
• Boann
• boar
• boar thistle
• board
• board foot
• board game
• board measure