Definition: A genus of lice (family Pediculidae) formerly grouped in the genus Pediculus. The main species is Pthirus pubis (formerly Pediculus pubis), the crab or pubic louse, a parasite that infests the pubes and neighboring hairy parts of the body.
[irreg. fr. G. phtheir, louse]
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Examples: glitazone, GI cocktail, etc.