outermost
adj.adj. the furthest away from the center or the middle of something. It describes the part that is on the very edge.
adj. situated at the greatest distance from the center or the interior of an object. Often used to describe the outermost layer or boundary of a physical structure.
The outermost layer of the skin is called the epidermis.
The planet Neptune is the outermost planet in our solar system, located farthest from the sun.
The architect designed the outermost walls with thick insulation to protect the interior from the extreme temperature fluctuations of the desert climate.
From Middle English uttermost, uttirmest, uttermast, outemast, alteration (due to Middle English outre (“outer”)) of Old English ūtemest, ȳtemest (“outermost”), equivalent to outer + -most. Doublet of uttermost.