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

peridermˈal adjective

• not to be sniffed at
• not to give a monkey's
• not to have a ghost
• not to have a ghost of a chance
• not to know a B from a battledore
• not to lead the life of a dog
• not to mention
• not to put too fine a point on it
• not to say
• not touch with a bargepole
• not to worry
• Notts.
• not turn a hair
• notum
• notungulate
• notungulates
• not unnaturally
• not up
• photogenic
• photogenies
• photogens
• photogeny
• photogeologies
• photogeology
• photoglyph