Medical Dictionary


adj in·fec·tious \in-ˈfek-shəs\

Medical Definition of INFECTIOUS

:  capable of causing infection <a carrier remains infectious without exhibiting signs of disease> <viruses and other infectious agents>
:  communicable by invasion of the body of a susceptible organism <all contagious diseases are also infectious, but it does not follow that all infectious diseases are contagious—W. A. Hagan>—compare contagious 1
in·fec·tious·ly adverb
in·fec·tious·ness noun
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears