Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Infestation with lice, especially crab lice; pediculosis.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An infestation with crab lice
  • n. A pediculosis

from the GNU version of the Collaborative International Dictionary of English

  • n. A disease (morbus pediculous) consisting in the excessive multiplication of lice on the human body.

from The Century Dictionary and Cyclopedia

  • n. The presence of lice on the body, with the irritation produced thereby and its effects; the lousy disease, formerly called morbus pediculosus.

Etymologies

Latin phthīriāsis, from Greek phtheiriāsis, from phtheiriān, to be lousy, from phtheir, louse.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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