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The head louse is an obligate ectoparasite of humans that causes head lice infestation. Head lice are wingless insects spending their entire life on the human scalp and feeding exclusively on human blood
any insect of the order Mallophaga  parasitic on birds and mammals, having mouthparts adapted for biting.louse up, Slang. to spoil; botch The verb meaning "to clear of lice" is from late 14 to louse up "ruin