virus
Definitions
An infective agent that typically consists of a nucleic acid molecule in a protein coat and is able to multiply only within the living cells of a host.
A piece of code which is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.
An element or influence that spreads throughout a community or environment and has a harmful or corrupting effect.
Examples
The scientist spent years studying how the virus replicates within human cells.
You should install an antivirus program to protect your computer from a malicious virus.
The doctor explained that the common cold is caused by a viral infection rather than a virus.