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a noun suffix occurring in loanwords from Greek: psoriasis.
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Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Origin of -iasis
<Greek, equivalent to -iā- v. formative + -sis-sis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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
Medical 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.