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.

• 虱任一种啮虫科（或腐蚀科）中的各种各样小的通常没有翅膀的小昆虫，它们中的一些类别以存放的面粉制品、纸张或捆书绳为食