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

• photochemists
• photochromic
• photochromics
• photochromies
• photochromism
• photochromisms
• photochromy
• photocoagulation
• photocomposition
• photoconducting
• photoconductive
• photoconductivity
• photocopiable
• photocopied
• photocopier
• photocopiers
• photocopies
• photocopy
• photocopying
• photocopyings
• photocurrent
• photocurrents
• photodegradable
• photodiode
• photodiodes