
Pthirus is a genus of lice. There are only two extant species. Pthirus gorillae infests gorillas, and Pthirus pubis afflicts humans, and is commonly known as the crab louse or pubic louse. ...
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A genus of lice (family Pediculidae) formerly grouped in the genus Pediculus. The main species is Pthirus pubis (Pediculus pubis), the crab or pubic louse, a parasite that infests the pubis and neighboring hairy parts of the body. Often incorrectly spelled Phthirus or Phthirius. ... Origin: irreg. Fr. G. Phtheir, louse ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: thī′rŭs Definitions: 1. 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.
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http://www.medilexicon.com/medicaldictionary.php?t=73818
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