1. Not permitting the passage of water
   - waterproof, waterproofed

See also: tight

• opalize
• opaque
• opaque gem
• opaquely
• opaqueness
• OPCW
• ope
• OPEC
• Opel
• open
• open access
• open account
• open chain
• open circuit
• open cluster
• open day
• open door
• open fire
• open fireplace
• open fracture
• open frame
• open house
• open interval
• open letter
• open marriage