Definify.com
Webster 1913 Edition
Bark louse
Bark′ louseˊ
.(Zool.)
An insect of the family
Coccidæ
, which infests the bark of trees and vines. ☞ The wingless females assume the shape of scales. The bark louse of the vine is
Pulvinaria innumerabilis
; that of the pear is Lecanium pyri
. See Orange scale
.