口径
こうけい aperture; bore
Why it means this
口 (the muzzle, the opening) + 径 (diameter) — the internal diameter of a gun barrel or lens.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.
こうけい aperture; bore
口 (the muzzle, the opening) + 径 (diameter) — the internal diameter of a gun barrel or lens.
Each character links to its full entry — origin story, stroke order, and readings.