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Meaning & Definition of Er in English

English

Er

/ər/

noun

1. A trivalent metallic element of the rare earth group

  • Occurs with yttrium
    synonym:
  • erbium
  • ,
  • Er
  • ,
  • atomic number 68

2. A room in a hospital or clinic staffed and equipped to provide emergency care to persons requiring immediate medical treatment

    synonym:
  • emergency room
  • ,
  • ER