noun Pathology.
a common chronic, inflammatory skin disease characterized by scaly patches.
Also called psora.

1675–85; < Neo-Latin < Greek psōríāsis, equivalent to psōriā-, variant stem of psōriân to have the itch (derivative of psṓra itch) + -sis -sis

psoriatic [sawr-ee-at-ik, sohr-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psoriasis (səˈraɪəsɪs)
a skin disease characterized by the formation of reddish spots and patches covered with silvery scales: tends to run in families
[C17: via New Latin from Greek: itching disease, from psōra itch]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1684, from L.L. psoriasis "mange, scurvy," from Gk. psoriasis "being itchy," from psorian "to have the itch," from psora "itch," related to psen "to rub."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

psoriasis pso·ri·a·sis (sə-rī'ə-sĭs)
A noncontagious inflammatory skin disease characterized by recurring reddish patches covered with silvery scales.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
psoriasis   (sə-rī'ə-sĭs)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Psoriasis is a common skin condition that causes skin redness and irritation.
Psoriasis is a common, chronic skin condition that causes red patches on the body.
Diagnosis and management of psoriasis and psoriatic arthritis in adults.
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