any of an order (Psocoptera) of small, winged insects with biting mouthparts
, including the book lice
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'psocid'
< ModL Psocidae
(< Gr psōchos
, dust < psōchein
, to rub small < IE base *bhes-
, to rub fine > sand
) + -idae