希土類元素 きどるいげんそ Also written 稀土類元素 Meanings Noun rare-earth element; rare-earth metal Kanji 希 hope. Read as キ. 土 soil 類 class. Read as ルイ. 元 source. Read as ゲン. 素 element. Read as ソ. Word lists Chemistry Jinuma: Japanese Dictionary · Word lists