- (v.i.) Contagious or poisonous matter, as of specific ulcers, the bite of snakes, etc.; -- applied to organic poisons.
- (v.i.) 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.
- (v.i.) Fig.: Any morbid corrupting quality in intellectual or moral conditions; something that poisons the mind or the soul; as, the virus of obscene books.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). virus. Retrieved September 21, 2026, from http://smartdefine.org/virus/definitions/2079873 |
| Chicago | Webster's. 2011. "virus" http://smartdefine.org/virus/definitions/2079873 (accessed September 21, 2026). |
| Harvard | Webster's 2011, virus, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/virus/definitions/2079873>. |
| MLA | Webster's. "virus" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/virus/definitions/2079873> |