outermost
farthest from center / furthest edge
Adjective
This term describes the absolute limit of a physical or conceptual boundary. It carries a sense of finality and extremity, indicating that nothing exists beyond this specific point in a given sequence or structure. In technical or biological contexts, it often refers to the protective shell or the primary interface between an organism or object and its external environment. It is more emphatic than outer, specifying the single most distant layer rather than any general exterior part.