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noun Pathology.
  1. a common chronic, inflammatory skin disease characterized by scaly patches.
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Origin of psoriasis

1675–85; < New Latin < Greek psōríāsis, equivalent to psōriā-, variant stem of psōriân to have the itch (derivative of psṓra itch) + -sis -sis
Also called psora.
Related formspso·ri·at·ic [sawr-ee-at-ik, sohr-] /ˌsɔr iˈæt ɪk, ˌsoʊr-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for psoriasis


  1. a skin disease characterized by the formation of reddish spots and patches covered with silvery scales: tends to run in families
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Derived Formspsoriatic (ˌsɔːrɪˈætɪk), adjective

Word Origin

C17: via New Latin from Greek: itching disease, from psōra itch
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

Word Origin and History for psoriasis


1680s, from medical Latin psoriasis, in Late Latin "mange, scurvy," from Greek psoriasis "being itchy," from psorian "to have the itch," from psora "itch, mange, scab," related to psen "to rub" (see psilo-). Related: Psoriatic.

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Online Etymology Dictionary, © 2010 Douglas Harper

psoriasis in Medicine


  1. A noncontagious inflammatory skin disease characterized by recurring reddish patches covered with silvery scales.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

psoriasis in Science


  1. A chronic, inflammatory skin disease in which recurring reddish patches, often covered with silvery scales, appear especially on the knees, elbow, scalp and trunk. Psoriasis is noncontagious and is inheritable.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.