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corkwood

noun

  1. any of several trees whose wood is very light; specif.,
    1. ☆ the only species (Leitneria floridana) of a family (Leitneriaceae, order Leitneriales) of dicotyledonous shrubs or small trees found in swampy regions of the SE U.S.
    2. ☆ the balsa
  2. the wood of any of these trees

See corkwood in American Heritage Dictionary 4

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