WordReference Random House Unabridged Dictionary of American English © 2020
elm bark′ bee′tle, 
  1. InsectsAlso called  smaller European elm bark beetle. a shiny, dark reddish-brown bark beetle, Scolytus multistriatus, originating in Europe and now widespread in the U.S.: the primary vector of Dutch elm disease.
  2. InsectsAlso called  native elm bark beetle. a bark beetle, Hylurgopinus opaculus, of eastern North America, that also transmits Dutch elm disease.
  • 1905–10

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