alkaline earth metal
noun [ C ] uk/ˌæl.kəl.aɪn ˈɜːθ ˌmet.əl/ us/ˌæl.kəl.aɪn ˈɝːθ ˌmet̬.əl/ (also alkaline earth, /ˌæl.kəl.aɪn ˈɜːθ / /ˌæl.kəl.aɪn ˈɝːθ /)
chemistry specialized碱土金属
any of the chemical elements beryllium, magnesium, calcium, strontium, barium, and radium. They react easily with other substances.