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

• Thompson submachine-guns
• -thon
• thon
• thonder
• thong
• thonged
• thongs
• Thor
• thorac-
• thoracal
• thoracenteses
• thoracentesis
• thoraces
• thoracic
• thoracic duct
• thoracic ducts
• thoraco-
• thoracocenteses
• thoracocentesis
• thoracoplasties
• thoracoplasty
• thoracoscope
• thoracoscopes
• thoracostomies
• thoracostomy