The outermost is the most outer part of something. When you say that something is the outermost part of something, you mean that it is the most visible, accessible, or public part of that something.
The outermost part of the cake was the frosting.
The outermost part of the ocean is the water.
adjective
situated at the farthest possible point from a center
Synonyms:
1
The outermost surfaces of the panel are plane.
2
The backing is adhered to the surfaces with the face outermost.
3
In the outermost ring , there are the angels of the judgment.
4
The corona is the outermost layer of the sun.
5
The episclera is the outermost layer of the sclera.
6
The outermost layer is composed of the cornea and sclera.
7
The valence shell is the outermost shell of an atom.
8
The hair cuticle is the outermost part of the hair shaft.
9
The outermost planet resides in the system's habitable zone.
10
The outermost tip of the fore end is smoothly contoured.