- In animals, a multilayered, extracellular, external body covering,
usually composed of fibrous molecules such as chitin
or collagen, and sometimes strengthened
by the deposition of minerals such as calcium carbonate. In arthropods
it is firm enough to act as a skeleton. In vertebrates, stratum
corneum, which is cellular, is occasionally called cuticle.
- A waxy layer that seals the outer surface of the epidermal cells of
the leaves and stems of vascular plants, helping to retain moisture.