sivuosan
Sivuosan is a Finnish noun meaning the side portion or lateral part of something. It is used to describe a component or region that is located at the side rather than at the front, back, or core of an object, system, or organism. The term appears in technical descriptions, diagrams, and other contexts where it is useful to distinguish a peripheral or auxiliary part from the main portion.
The base form is sivuosa, and sivuosan is the genitive singular form, used to indicate possession or
Etymology and usage: sivuosa is a compound of sivu (side) and osa (part). The word is productive
See also: pääosa (main part), sisäosa (inner part), ulkopaikka not a standard term; sivuluku (not directly related)