| Bark louse | (Zool.) An insect of the family ☞ 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. [ 1913 Webster ] |
| bark-louse | (n) any of several insects living on the bark of plants, Syn. bark louse |