In*fec"tious (?), a. [Cf. F. infectieux.]

1.

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

Where the infectious pestilence. Shak.

2.

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

It [the court] is necessary for the polishing of manners . . . but it is infectious even to the best morals to live always in it. Dryden.

3. Law

Contaminating with illegality; exposing to seizure and forfeiture.

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

4.

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

The laughter was so genuine as to be infectious. W. Black.

Syn. -- See Contagious.

 

© Webster 1913.

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