


ϵ r, a representation for relative static permittivity.Extraction ratio, a pharmacokinetic property.Estrogen receptor, a type of protein molecule.Equine exertional rhabdomyolysis, a syndrome that damages muscle tissue in horses.Endoplasmic reticulum, a type of organelle in cell biology.Emergency room, the emergency department in a medical facility specializing in acute, emergency care, usually found in a hospital or other primary care center.Error Resilience, an audio coding method used in MPEG-4 Part 3.Entity–relationship model, a conceptual representation of data.er, country code top-level domain (ccTLD) for Eritrea Erhua (儿化), rhotacization of spoken syllables in Beijing dialect of Mandarin Chinese with the -er suffix (儿).Oxford "-er", a suffix used to form words like rugger and footer.-er, a suffix added to a verb to make it an agent noun (e.g., cut to cutter).-er, a suffix added to a noun to indicate resident of, as in New Yorker.-er, a suffix added to adjectives or adverbs to form a comparative (e.g., fast to faster).Er, alternate spelling for Yer ( Ъ / ъ), the hard-sign letter of the Cyrillic alphabet.Er (cuneiform), a sign in cuneiform writing.Er (Cyrillic) ( Р / р), a letter of the Cyrillic alphabet corresponding to the Latin letter "R".United Russia, or Yedinaya Rossiya, a Russian political party.

Entre Ríos Railway in Argentina (reporting mark ER).Eldorado Resorts, a gaming company located in Reno, Nevada.Eldorado Reno, a hotel and casino in Reno, Nevada.E/R, a 1984–1985 American television sitcom.ER (TV series), a 1994–2009 American television medical drama series.Chico Enterprise-Record, the daily newspaper of Chico, California."ER", a song by Royce da 5'9" featuring Kid Vishis from Success Is Certain."ER" (song), a 2012 single by Japanese boy band Kanjani Eight.Edward Rex (ER or E VIIR), the royal cypher of King Edward VIIĪrts, entertainment, and media Music.Elizabeth II Regina (E IIR), the royal cypher of Elizabeth II.Elizabeth Regina (ER), the royal cypher of Elizabeth I.Er (biblical person), the eldest son of Judah in the biblical book of Genesis.English Republic, another name for the Commonwealth of England under Cromwell.East Rochester, New York, a town in the United States.
