English noun: Er | |||
1. | Er (substance) a trivalent metallic element of the rare earth group; occurs with yttrium | ||
Synonyms | atomic number 68, erbium | ||
Broader (hypernym) | metal, metallic element | ||
Substance meronym | fergusonite, gadolinite, ytterbite | ||
2. | ER (artifact) a room in a hospital or clinic staffed and equipped to provide emergency care to persons requiring immediate medical treatment | ||
Synonyms | emergency room | ||
Broader (hypernym) | hospital room | ||