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1. Expression of hesitation
   "I, er, forgot what I was going to say";
   - um, uh

1. Emergency department in a hospital or clinic, staffed and equipped to provide emergency care to people requiring immediate medical treatment
   - emergency room [N. Amer], A&E [Brit], accident and emergency [Brit], emergency [N. Amer], casualty [Brit]

1. A trivalent metallic element of the rare earth group; occurs with yttrium
   - erbium, atomic number 68

Sounds like: err, U

Type of: hospital room, metal, metallic element

Part of: fergusonite, gadolinite, ytterbite

Encyclopedia: Er, Orba, Feron and Fergna