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 butterfly weed /-ˌwɪd/ 名詞

 Pleu·ri·sy n.  Med. An inflammation of the pleura, usually accompanied with fever, pain, difficult respiration, and cough, and with exudation into the pleural cavity.
 Pleurisy root. Bot. (a) The large tuberous root of a kind of milkweed (Asclepias tuberosa) which is used as a remedy for pleuritic and other diseases. (b) The plant itself, which has deep orange-colored flowers; -- called also butterfly weed.
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 butterfly weed
      n : erect perennial of eastern and southern United States having
          showy orange flowers [syn: orange milkweed, chigger
          flower, chiggerflower, pleurisy root, tuber root,
          Indian paintbrush, Asclepias tuberosa]