-osis Definition
ōsis
suffix
Condition; process; action.
Osmosis.
American Heritage
Diseased or abnormal condition.
Acidosis.
American Heritage
Increase; formation.
Leukocytosis.
American Heritage
affix
State, condition, action.
Hypnosis.
Webster's New World
An abnormal or diseased condition.
Psychosis, mycosis.
Webster's New World
Increase or formation.
Leukocytosis.
Webster's New World
Origin of -osis
L < Gr -ōsis < -ō-, -o-, ending of preceding verbal or substantive stem + -sis
From Webster's New World College Dictionary, 5th Edition
From Ancient Greek -οσις ("-osis"; state, condition, or action).
From Wiktionary
Latin -ōsis from Greek n. suff
From American Heritage Dictionary of the English Language, 5th Edition
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