a noun suffix occurring in loanwords from Greek: psoriasis.
Compare -asis.

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

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World English Dictionary
-iasis or -asis
n combining form
Compare -osis (in medicine) indicating a diseased condition: psoriasis
[from New Latin, from Greek, suffix of action]
-asis or -asis
n combining form
[from New Latin, from Greek, suffix of action]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

-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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