Pronunciation key

( ĕk′sō-dûrmǐs )



  1. Botany. Temporary protective layer of cells in some roots such as in certain species of orchids.
Usborne Science Encyclopedia ©2002: "All parts of a juvenile plant are surrounded by a thin layer of tender tissue called the epidermis. In older stems, the epidermis is replaced by bark. In other roots is is replaced by a layer of hardened cells called an exodermis, then by bark. An outer tissue which encloses the plant such as the epidermis is known as dermal tissue."


  • The American College Dictionary (Random House) ©1949
  • Usborne Science Encyclopedia ©2002
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