Webster's English Dictionary

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louse

1. louse \'lau.s\ \'li-s\ n or lice or lous.es [ME lous, fr. OE lu-s; akin 
   to OHG lu-s louse, W lla]u lice pl  1a: any of various small wingless usu. 
   flattened insects (orders Anoplura a nd Mallophaga) parasitic on 
   warm-blooded animals; broadly : a small usu. sluggish arthropod that lives 
   on other animals or on plants and sucks their blood or juices 1b: any of 
   several small arthropods that are not parasitic  pl  2: a contemptible 
   person : HEEL 
2. louse \'lau.s, 'lau.z\ vt : to pick lice from : DELOUSE