a noun suffix occurring in loanwords from Greek: psoriasis.
Origin of -iasis
< Greek, equivalent to -iā- v. formative + -sis -sis
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n combining form
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
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
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.