booklouse

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various small, often wingless insects of the order Psocoptera (or Corrodentia), some species of which feed on stored flour products, paper, or bookbindings.

Century Dictionary and Cyclopedia

1. n. A minute neuropterous insect of the family Psocidæ, distinguished by having the tarsi composed of only two or three joints, and the posterior wings smaller than the anterior. Atropus pulsatorius is destitute of wings, and is very destructive to old books, especially in damp places, and to collections of dried plants, etc.

Wiktionary

1. n. Any of the small insects who feed on bookbindings, especially those of the order Psocoptera.

GNU Webster's 1913

1. n. (Zoöl.) one of several species of minute, wingless insects injurious to books and papers. They belong to the Pseudoneuroptera.
2. n. (Zoöl.) a minute wingless psocopterous insect (Liposcelis divinatorius) injurious to books and papers.

WordNet 3.0

1. n. minute wingless psocopterous insects injurious to books and papers
2. n. minute wingless psocopterous insects injurious to books and papers