Refers to the actual shell of a tortoise or turtle. Also used in set phrases like 亀の甲より年の功 (wisdom comes with age).
See also: 亀甲
I found a large tortoise shell on the beach.
hexagon pattern; benzene ring; tortoise-shell shape
Describes a hexagonal pattern or shape resembling a tortoise shell. Sense 3 is a technical term for a benzene ring in chemistry. Sense 4 is a Go term for a specific shape.
This cloth has a tortoise-shell pattern.
In chemistry, a benzene ring is sometimes called a tortoise shell.
In Go, this shape is called a tortoise shell.