1 文書を見つけるための辞書。

• atomic number 69, thulium, tm
• ツリウム
• a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
• 柔らかで銀色の希土類金属元素