[thahy-rahy-uh-sis, thi-]


crab lice infestation.

Origin of phthiriasis

1590–1600; < Greek phtheiríāsis, equivalent to phtheír louse + -iāsis -iasis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for phthiriasis

Historical Examples of phthiriasis

British Dictionary definitions for phthiriasis



pathol the state or condition of being infested with lice; pediculosis

Word Origin for phthiriasis

C16: via Latin from Greek, from phtheir louse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

phthiriasis in Medicine


[thĭ-rīə-sĭs, thī-]


Infestation with lice, especially crab lice; pediculosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.