periderm /perˈi-dûrm/

1. The horny cuticular covering of a hydroid colony
2. The cork cambium with the cork and other tissues derived from it, forming a protective outer covering in plants

• watchtowers
• watch up
• watchword
• watchwords
• wate
• water
• water about
• waterage
• waterages
• water avens
• water bag
• water bags
• water bailie
• water bailiff
• water bailiffs
• water ballast
• water ballasts
• water barometer
• water barometers
• water barrel
• water barrels
• water bath
• water baths
• water batteries
• water battery