a suffix occurring in nouns that denote actions, conditions, or states (hypnosis; leukocytosis; osmosis), especially disorders or abnormal states (chlorosis; neurofibromatosis; tuberculosis).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for -osis
suffix forming nouns
indicating a process or statemetamorphosis
indicating a diseased conditiontuberculosis Compare -iasis
indicating the formation or development of somethingfibrosis
Word Origin for -osis
from Greek, suffix used to form nouns from verbs with infinitives in -oein or -oun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for -osis
word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for -osis
Condition; process; action:osmosis.
Diseased or abnormal condition:proptosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for -osis
A suffix that means:
Diseased condition, as in tuberculosis.
Condition or process, as in osmosis.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.