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. 2018

British Dictionary definitions for -iasis



n combining form
  1. (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

-iasis in Medicine


  1. 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.