epidermis is the outermost covering of the leaf
it is the outer most layer of the leave and so covers the leave surface except at the stomata
Adventitia is a 10 letter word for outermost covering of an organ.
sclera
It is the integumentary system, or skin.
The outermost layer of the skin is called the epidermis.
The leaf margin is the outermost boundry line of the leaf lamena. It determines the shape of the leaf.
The Veins
cortex
membrane or plasma membrane.
The outermost protective covering the the brain is the dura mater, the outermost of the meningeal layers.
The outermost layer of a root is called the epidermis. It is a single layer of cells that protects and covers the root. In stems and leaves, the outermost layer is also called the epidermis, and it serves a similar protective function.
cuticle