from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to contagion.
- adj. Transmissible by direct or indirect contact; communicable: a contagious disease.
- adj. Capable of transmitting disease; carrying a disease: stayed at home until he was no longer contagious.
- adj. Spreading or tending to spread from one to another; infectious: a contagious smile.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a disease, easily transmitted to others.
- adj. Of a fashion, laughter, etc., easily passed on to others.
- adj. Of a person, having a disease that can be transmitted to another person by touch.
from the GNU version of the Collaborative International Dictionary of English
- adj. Communicable by contact, by a virus, or by a bodily exhalation; catching.
- adj. Conveying or generating disease; pestilential; poisonous.
- adj. Spreading or communicable from one to another; exciting similar emotions or conduct in others.
from The Century Dictionary and Cyclopedia
- Communicable by contagion; that may be imparted by contact or by emanations; catching: as, a contagious disease.
- Containing or generating contagion; poisonous; pestilential: as, contagious air; contagious clothing.
- Propagated by influence or incitement; exciting like feeling or action; spreading or liable to spread from one to another: as, contagious example; a contagious speculation.
- Arising from or due to contagion, in either sense; brought about by propagation or incitement: as, a contagious epidemic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. (of disease) capable of being transmitted by infection
- adj. easily diffused or spread as from one person to another
Sorry, no etymologies found.
I used the word contagious rather than dangerous on purpose.
Among the infectious diseases are some that are quite directly and quickly conveyed from person to person and to these the term contagious is applied.
To quell demonstrations after the Sean Bell killing, he asked the Rand Corporation to investigate what he termed "contagious shooting."
Our daughter has just learned the word contagious and uses it every chance she gets.
And this: The danger facing the crew is a "linguistic virus" that spreads by forcing its victims to utter a certain contagious phrase that kills the listener in a gruesome way.
He also mentions that "some use with good effect the drinking of one's own urine ... for protection in contagious times."
Panic is usually defined as contagious, groundless, unreasoning fear.
In it, Gladwell chronicles events, episodes and trends that he describes as contagious or viral or in the most extreme language, epidemics.
That the plague was not what is commonly called contagious, like the scarlet fever, or extinct small-pox, was proved.
It is sometimes called contagious, infectious, and epizoötic pleuro-pneumonia, -- contagious or infectious, from its supposed property of transmission from the diseased to the healthy animal.
Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, And Feeding and Management; With the Diseases to which They are Subject, And The Remedies Best Adapted to their Cure