bedbug

[bed-buhg]
noun
1.
a flat, wingless, bloodsucking hemipterous insect, Cimex lectularius, that infests houses and especially beds.
2.
any of several other bloodsucking bugs of the family Cimicidae.
Also, bed bug.


Origin:
1800–10; bed + bug1

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Collins
World English Dictionary
bedbug (ˈbɛdˌbʌɡ)
 
n
any of several bloodsucking insects of the heteropterous genus Cimex, esp C. lectularius of temperate regions, having an oval flattened wingless body and infesting dirty houses: family Cimicidae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

bedbug
1809, from bed + bug.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bedbug bed·bug (běd'bŭg')
n.
A wingless, odorous insect with a flat, reddish body that infests dwellings and bedding and feeds on human blood.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for bedbugs
Because of their dislike for sunlight, bedbugs come out at night.
All bedbugs mate via a process termed traumatic insemination.
Therefore bedbugs are less dangerous than some more common insects such as the
  flea.
Bedbugs thrive in places with high occupancy, such as hotels.
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