1. state, condition, action
2. an abnormal or diseased condition
⇒ psychosis, mycosis
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of '-osis'L < Gr -ōsis < -ō-, -o-, ending of preceding verbal or substantive stem + -sis