-iasis

1. a noun suffix occurring in loanwords from Greek:

   psoriasis.

-iasis

combining form

1. (in medicine) indicating a diseased condition Compare -osis

   psoriasis

Word History and Origins

Origin of -iasis¹

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

Word History and Origins

Origin of -iasis¹

from New Latin, from Greek, suffix of action