Look up: viruses

1. viruses
   virus
   Found on http://foldoc.org/viruses
   
   
2. viruses
   (Humans as organisms) ultramicroscopic non-cellular organisms that replicate themselves inside the cells of living hosts
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
3. Viruses
   Infectious agents that invade and replicate in living cells and can cause disease.
   Found on http://www.encyclo.co.uk/local/20560
   
   
4. Viruses
   Viruses: Small living particles that can infect cells and change how the cells function. Infection with a virus can cause a person to develop symptoms. The disease and symptoms that are caused depend on the type of virus and the type of cells that are infected.
   Found on http://www.medterms.com/script/main/art.
   
   
5. viruses
   <microbiology, virology> An ultra-microscopic micro-organism, parasitic within living cells and of which many can cause disease in humans. They consist of a strand of nucleic acid (DNA or RNA) that contains genetic instructions concerning viral reproduction that is enveloped by a protein coat....
   Found on http://www.mondofacto.com/facts/dictiona
   
   
6. Viruses
   extremely small and simple microbes. They are nothing more than a small segment of DNA surrounded by a protective shell. Viruses cannot reproduce on their own, they must take over the normal cell reproduction of another living host.
   Found on http://www.coml.org/edu/glossary/g1.htm
   
   
7. VIRUSES
   Minute, nonliving infectious disease agents composed primarily of protein and nucleic acid (either RNA or DNA), and characterized by the absence of independent metabolism and an inability to replicate outside susceptible host cells.
   Found on http://www.thehorse.com/Glossary.xhtml?L
   
   
8. Viruses
   Small living particles that can infect cells and change how the cells function. Infection with a virus can cause a person to develop symptoms. The disease and symptoms that are caused depend on the type of virus and the type of cells that are infected.
   Found on http://www.medicinenet.com/food_poisonin