barklouse 🔊 Listen to this < /ˈbɑrkˌlaɪs/. any of numerous insects of the order Psocoptera that live on the bark of trees and other plants. Bark Louse – Blastopsocus lithinus – Liberal Dictionary Psocoptera – Wikipedia File:Barklouse (16440352565).jpg – Wikimedia Commons Cave Barklouse from Germany – What’s That Bug? Share Facebook Twitter Google +