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-asis

1.
a suffix occurring in scientific, especially medical, words from Greek:
psoriasis.
Origin
< Latin < Greek -iā- verb stem + -sis -sis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -asis

-asis

suffix
1.
a variant of -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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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