Etymology
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bedbug (n.)

also bed-bug, "blood-sucking insect that infests beds and bedding," 1772, from bed (n.) + bug (n.).

[The bed bug] is supposed to have been first introduced to this country in the fir timber that was brought over to rebuild London after it had suffered by the great fire; for it is generally said that Bugs were not known in England before that time, and many of them were found almost immediately afterwards in the new-built houses. [the Rev. W. Bingley, "Animal Biography; or Anecdotes of the Lives, Manners, and Economy of the Animal Creation," London, 1803]

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Definitions of bedbug

bedbug (n.)
bug of temperate regions that infests especially beds and feeds on human blood;
Synonyms: bed bug / chinch / Cimex lectularius
From wordnet.princeton.edu