The singular of lice is louse.

Note from biology: Lice, together with 5 thousand species of wingless insects, belong to the order Phthiraptera. Lice are parasites, who always choose warm-blooded hosts, so they can dwell and feed in the hair of any mammal or bird (they only stay away from monotremes, pangolins, bats and cetaceans).

Disgusting, isn't it?


More Info: en.wikipedia.org