Bed·bug n. Zool. A wingless, bloodsucking, hemipterous insect (Cimex Lectularius), sometimes infesting houses and especially beds.  See Illustration in Appendix.

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 Bug n.
 1. A bugbear; anything which terrifies. [Obs.]
 Sir, spare your threats:
 The bug which you would fright me with I seek.   --Shak.
 2. Zool. A general name applied to various insects belonging to the Hemiptera; as, the squash bug; the chinch bug, etc.
 3. Zool. An insect of the genus Cimex, especially the bedbug (Cimex lectularius). See Bedbug.
 4. Zool. One of various species of Coleoptera; as, the ladybug; potato bug, etc.; loosely, any beetle.
 5. Zool. One of certain kinds of Crustacea; as, the sow bug; pill bug; bait bug; salve bug, etc.
 Note: ☞ According to popular usage in England and among housekeepers in America around 1900, bug, when not joined with some qualifying word, was used specifically for bedbug.  As a general term it is now used very loosely in America as a colloquial term to mean any small crawling thing, such as an insect or arachnid, and was formerly used still more loosely in England.  “God's rare workmanship in the ant, the poorest bug that creeps.” --Rogers (--Naaman). “This bug with gilded wings.” --Pope.
 Bait bug. See under Bait.
 Bug word, swaggering or threatening language. [Obs.]

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 Chinch n.
 1. Zool. The bedbug (Cimex lectularius).
 2. Zool. A bug (Blissus leucopterus), which, in the United States, is very destructive to grass, wheat, and other grains; -- also called chiniz, chinch bug, chink bug. It resembles the bedbug in its disgusting odor.

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 Cimex lectularius
      n : bug of temperate regions that infests especially beds and
          feeds on human blood [syn: bedbug, bed bug, chinch]