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a noun suffix occurring in loanwords from Greek:
Compare -asis.
Origin of -iasis
< Greek, equivalent to -iā- v. formative + -sis -sis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for -iasis


combining form
(in medicine) indicating a diseased condition: psoriasis Compare -osis (sense 2)
Word Origin
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
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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
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-iasis in Medicine

-iasis suff.
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.
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