Diameter
noun
Fix the diameter. It is the wrong diameter and must be a new diameter. Test it now, what's the diameter?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この円の直径は10センチです。
The diameter of this circle is ten centimeters.
地球の直径は約12,742キロメートルです。
The diameter of the Earth is about 12,742 kilometers.
ケーキの直径20センチって書いてたのに、実物は5ミリ短かったんです！
The cake was labeled as twenty cm in diameter, but the actual one was five mm short!
直径100フィートもある巨大な新種のクラゲが、ビーチをドロドロにしてしまいました。
A new, gigantic species of jellyfish with a 100 foot diameter oozed onto the beach.