Sisäura
Sisäura is a Finnish term referring to an interior groove, channel, or recess located inside a component or object. The word is formed from sisä (“inside”) and ura (“groove,” “furrow,” or “track”) and is mainly used in technical and engineering contexts to describe features that run on or within an interior surface.
In mechanical design and manufacturing, sisäura denotes a groove inside a bore, housing, or shaft where seals,
The term also appears in plumbing, electrical, and piping contexts to describe internal channels or recesses
In biology or anatomy, sisäura is less standardized and is not a common formal term; when used,
Overall, sisäura is a specialized, mostly technical term that highlights an inwardly located groove or channel,