-iasis

1.
a noun suffix occurring in loanwords from Greek:
psoriasis.
Compare -asis.
Origin
< Greek, equivalent to -iā- v. formative + -sis -sis
British Dictionary definitions for -iasis

-iasis

combining form
1.
(in medicine) indicating a diseased condition: psoriasis Compare -osis (sense 2)
Word Origin
from New Latin, from Greek, suffix of action
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.

-iasis in Medicine

-iasis suff.
A pathological condition characterized or produced by: teniasis.