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Noun or has 2 senses
  1. Oregon, Beaver State, OR - a state in northwestern United States on the Pacific
    --1 is a kind of American state
    --1 is a part of
     United States, United States of America, America, US, U.S., USA, U.S.A.
    --1 has parts:
     Crater Lake National Park; Bend; Eugene; Klamath Falls; Medford; Portland; Salem, capital of Oregon; Klamath, Klamath River; Snake, Snake River; Willamette, Willamette River
  2. operating room, OR, operating theater, operating theatre, surgery - a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
    --2 is a kind of hospital room
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