Answer:
Please note the term Cuticle is used interchangeably between human Anatomy to describe the area above the finger or toe nail, it is also used in Botany to describe the waxy covering of a leaf or thickened skin of fruit; additionally the term is used in Entomology to describe the covering of insects
This answer refers to the Botanical reference of Cuticle; refer to the related question "What is a cuticle" for the Anatomical definition.
Plant cuticles are a protective waxy covering produced only by the epidermal cells of leaves, young shoots and all other aerial plant organs without periderm. The cuticle tends to be thicker on the top of the leaf, but is not always thicker in xerophytic plants living in dry climates than in mesophytic plants from wetter climates, despite a persistent myth to that effect.