Meaning of "bed bug"

a bloodsucking bug that is a parasite of birds and mammals.

bed·bug

bĕd′bŭg′
bed·bug also bed bug  (bĕd′bŭg′)
n.
Any of several small wingless parasitic insects of the family Cimicidae, especially Cimex lectularius, which infests dwellings and bedding and feeds on human blood. Also called regionally chinch.

bedbug

ˈbɛdˌbʌɡ
bedbug (ˈbɛdˌbʌɡ)
n
(Animals) 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

bed′bug`

bed′bug` or bed′ bug`, n.
a flat, wingless, bloodsucking bug, Cimex lectularius, that infests houses and esp. beds.
[1800–10]