a noun suffix occurring in loanwords from Greek: psoriasis.

Nearby words

  1. -i-,
  2. -ia,
  3. -ial,
  4. -ian,
  5. -iana,
  6. -iatric,
  7. -iatrics,
  8. -iatry,
  9. -ibility,
  10. -ible

Compare -asis.

Origin of -iasis

< Greek, equivalent to -iā- v. formative + -sis -sis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for -iasis



n combining form

(in medicine) indicating a diseased conditionpsoriasis Compare -osis (def. 2)

Word Origin for -iasis

from New Latin, from Greek, suffix of action

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 -iasis


medical Latin word-forming element meaning "process; morbid condition," from Greek -iasis, from aorist of verbs in -iao, which often express disease.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for -iasis



A pathological condition characterized or produced by:teniasis.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.