Wood louse

(Zool.)	Any one of numerous species of terrestrial isopod Crustacea belonging to Oniscus, Armadillo, and related genera. See Sow bug, under Sow, and Pill bug, under Pill.
	Any one of several species of small, wingless, pseudoneuropterous insects of the family Psocidæ, which live in the crevices of walls and among old books and papers. Some of the species are called also book lice, and deathticks, or deathwatches.