bark beetle

noun
any of numerous small, cylindrical beetles of the family Scolytidae that nest under the bark of hardwood trees, leaving intricate tracings on the wood.


Origin:
1860–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
bark beetle
 
n
any small beetle of the family Scolytidae, which bore tunnels in the bark and wood of trees, causing great damage. They are closely related to the weevils

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Bark beetle is always a great word to know.
So is ninnyhammer. Does it mean:
a gadget; dingus; thingumbob.
a fool or simpleton; ninny.
Example sentences
Bark beetle outbreaks often follow these events and can result in substantial
  damage to surrounding trees.
These trees have been killed by the spruce bark beetle.
Changes to watershed processes will occur as a result of the bark beetle
  epidemic.
The pattern and range of movement of a checkered beetle predator relative to
  its bark beetle prey.
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