径 diameter

(goleft) + (take a dump) Same-ON

Onyomi

KEI

Mnemonic

It is OK to go all the way across the diameter of a circle to take a dump. Pooping in the middle is a bit gauche, though.

Jukugo

直径(ちょっけい)	diameter ★☆☆☆☆ 直 (correct a problem / direct contact) + 径 (diameter) = 直径 (diameter)
半径(はんけい)	radius ☆☆☆☆☆ 半 (half) + 径 (diameter) = 半径 (radius)

Lookalikes

	Meaning	Hint	Radical
役	role	THROW
径	diameter	DUMP

The pitcher's role is to THROW,

but if you gotta expand your sphincter's diameter, you gotta TAKE A DUMP .

	Meaning	Hint	Radical
軽	lightweight	CAR	車
怪	suspicious	HEART	心
径	diameter	GO	行
経	experience	STRING	糸

The new CAR is lightweight but
suspicious HEARTS are hard to mate.
I'll GO walk around the diameter,
and measure the length of my experience with STRING.