1. virus - Noun
2. virus - Verb
Contagious or poisonous matter, as of specific ulcers, the bite of snakes, etc.; -- applied to organic poisons.
The special contagion, inappreciable to the senses and acting in exceedingly minute quantities, by which a disease is introduced into the organism and maintained there.
Fig.: Any morbid corrupting quality in intellectual or moral conditions; something that poisons the mind or the soul; as, the virus of obscene books.
Source: Webster's dictionaryLove is like a virus. It can happen to anybody at any time. Maya Angelou
Think of the earth as a living organism that is being attacked by billions of bacteria whose numbers double every forty years. Either the host dies, or the virus dies, or both die. Gore Vidal
Ignorance is a virus. Once it starts spreading, it can only be cured by reason. For the sake of humanity, we must be that cure. Neil deGrasse Tyson
Language is a virus from outer space. William S. Burroughs
Only one form of contagion travels faster than a virus. And that's fear. Dan Brown
The Orlando terrorist may be dead, but the virus that poisoned his mind remains very much alive. And we must attack it with clear eyes, steady hands, unwavering determination and pride in our country and our values. Hillary Clinton