dividing line; intermediate line
A line that separates or marks a boundary between two areas, or a line positioned between two others. Used in contexts like sports, geography, or diagrams.
A center line is drawn in the middle of the court.
We drew a dividing line on the map to separate the areas.
intermediate rays
Rare technical term, possibly in optics or physics, referring to rays that are neither the shortest nor the longest. Limited to specialized contexts.
In this optical system, the refraction of intermediate rays becomes an issue.
Compound of 中間 (middle, intermediate) and 線 (line).