SG Heritage Dictionary

Infectious [Adjective] Webster's Dictionary 1828

1. Having qualities that may taint, or communicate disease to; as an infectious fever; infectious clothing; infectious air; infectious miasma.

2. Corrupting; tending to taint by communication; as infectious vices or manners.

4. Contraband articles are said to be of an infectious nature.

5. Capable of being communicated by near approach.

6. Grief as well as joy is infectious

Infectious [Adjective] Webster's Dictionary 1913

1. Having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious air; infectious vices.

2. Corrupting, or tending to corrupt or contaminate; vitiating; demoralizing.

4. Capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth.

Infectiously [Adverb] Webster's Dictionary 1828

Infectiously [Adverb] Webster's Dictionary 1913

In an infectious manner.

Infectiousness [Noun] Webster's Dictionary 1828

The quality of being infectious, or capable of communicating disease or taint from one to another.

Infectiousness [Noun] Webster's Dictionary 1913

The quality of being infectious.