- communicable by infection, as from one person to another or from one part of the body to another: infectious diseases.
- causing or communicating infection.
- tending to spread from one to another: infectious laughter.
- Law. capable of contaminating with illegality; exposing to seizure or forfeiture.
- Obsolete. diseased.
Origin of infectious
SynonymsSee more synonyms on Thesaurus.com
1. See contagious.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for infectiousness
He is just too cool for school in a country desperate for the infectiousness of rejuvenation.Buzz Bissinger: Why I’m Voting for Mitt Romney
October 8, 2012
And again, as in the case of Tolstoy and his canon of infectiousness, we must ask, What soul?Parallel Paths
Thomas William Rolleston
The duration of infectiousness may be longer, although it is not the rule.The Third Great Plague
John H. Stokes
The second discovery which I shall mention is that of the infectiousness of tuberculosis.The Pros and Cons of Vivisection
Of the infectiousness of nervous disease it seems almost useless at present to speak, for few will listen.The Modern Malady
And not only is infection a sure sign of art, but the degree of infectiousness is also the sole measure of excellence in art.The Kingdom of God is Within You, What is Art
Lyof N. Tolstoi
- (of a disease) capable of being transmittedCompare contagious
- (of a disease) caused by microorganisms, such as bacteria, viruses, or protozoa
- causing or transmitting infection
- tending or apt to spread, as from one person to anotherinfectious mirth
- international law
- tainting or capable of tainting with illegality
- rendering liable to seizure or forfeiture
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for infectiousness
Online Etymology Dictionary, © 2010 Douglas Harper
- Capable of causing infection.
- Caused by or capable of being transmitted by infection.
- Caused by a pathogenic microorganism or agent.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Capable of causing infection. See Note at contagious.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.