a suffix occurring in scientific, especially medical, words from Greek: psoriasis.

< Latin < Greek -iā- verb stem + -sis -sis

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World English Dictionary
suffix forming nouns
a variant of -iasis

-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]

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