opportunistic

[ op-er-too-nis-tik, -tyoo- ]
/ ˌɒp ər tuˈnɪs tɪk, -tyu- /

adjective

adhering to a policy of opportunism; practicing opportunism.
Pathology.
  1. (of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired.
  2. (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

First recorded in 1890–95; opportunist + -ic

OTHER WORDS FROM opportunistic

op·por·tun·is·ti·cal·ly, adverb un·op·por·tun·is·tic, adjective

WORDS THAT MAY BE CONFUSED WITH opportunistic

opportune opportunistic

Example sentences from the Web for opportunistic

British Dictionary definitions for opportunistic

opportunistic
/ (ˌɒpətjʊˈnɪstɪk) /

adjective

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

Derived forms of opportunistic

opportunistically, adverb

Medical definitions for opportunistic

opportunistic
[ ŏp′ər-tōō-nĭstĭk ]

adj.

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.