Cuticle
（重定向自Cuticula）
A cuticle /ˈkjuːtɪkəl/, or cuticula, is a term used for any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of "cuticle" are non-homologous, differing in their origin, structure, function, and chemical composition.