- adhering to a policy of opportunism; practicing opportunism.
- (of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired.
- (of a disease or infection) caused by such an organism: Pneumocystis pneumonia is an opportunistic disease that often strikes victims of AIDS.
Origin of opportunistic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- of or characterized by opportunism
- med (of an infection) caused by any microorganism that is harmless to a healthy person but debilitates a person whose immune system has been weakened by disease or drug treatment
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 unopportunistic
Online Etymology Dictionary, © 2010 Douglas Harper
- Of or relating to an organism capable of causing disease only in a host whose resistance is lowered.
- Of or relating to a disease caused by an opportunistic organism.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.