ベリリウムベリリウムMeanings1nounberyllium (Be)Chemical element with atomic number 4. Used in technical and scientific contexts.ベリリウムは軽かるくて硬かたい金きん属ぞくです。Beryllium is a light and hard metal.ベリリウムは原げん子し番ばん号ごう4の元げん素そです。Beryllium is the element with atomic number 4.