biologya simple living thing that is smaller than bacteria and that can enter your body and make you ill. If your body can protect itself against a particular virus, then you are immune to it. A vaccine is a medicine that makes you immune to a particular virus
Malaria is caused by a virus carried by mosquitos.
the AIDS virus
Synonyms and related words
Microorganisms and bacteria
ameba
amoeba
bacillus
1a
a disease caused by a virus
I’ve been in bed all week with a virus.
Synonyms and related words
General words for illnesses, diseases and medical conditions
illness
disease
sickness
See alsobacteria
2
computinga program that enters your computer and damages or destroys information that you have stored
Most viruses are spread over the Internet.
Synonyms and related words
Computer programs and systems
add-on
applet
architecture
virus
noun countable
US /ˈvaɪrəs/
Other entries for this word
Zika virusnoun
virus checkernoun
computer virusnoun
Schmallenberg virusnoun
Epstein-Barr virusnoun
Ebola virusnoun at Ebola
Word Forms
singular
virus
plural
viruses
DEFINITIONS2
1
biologya simple living thing that is smaller than bacteria and that can enter your body and make you sick. If your body can protect itself against a particular virus, then you are immune to it. A vaccine is a medicine that makes you immune to a particular virus
Malaria is caused by a virus carried by mosquitos.
the AIDS virus
Synonyms and related words
Microorganisms and bacteria
ameba
amoeba
bacillus
1a
a disease caused by a virus
I’ve been in bed all week with a virus.
Synonyms and related words
General words for illnesses, diseases and medical conditions
illness
disease
sickness
See alsobacteria
2
computinga program that enters your computer and damages or destroys information that you have stored