1. (abbreviation) .  emergency room.
  2. (abbreviation) .  Elizabeth Regina.
  3. (abbreviation) .  (computing) entity-relationship model or entity-relationship diagram.
  4. (abbreviation) .  (biology) endoplasmic reticulum.
  5. (abbreviation) .  (baseball) The statistic "Earned Run"; a run that was scored without the aid of an error by the fielding team that is charged to the pitcher responsible for allowing the runner that scored to reach base.
  6. Interjection.  (UK) (non-gloss definition, Said when hesitating in speech.) .
  7. Verb.  (informal) To utter the word "er" when hesitating in speech, found almost exclusively in the phrase '''um and er'''.

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This entry was last updated on RefTopia from its source on 3/20/2012.