Dictionary
in•fec•tious
Pronunciation: (in-fek'shus), [key]—
adj.
1. communicable by infection, as from one person to another or from one part of the body to another:
infectious diseases.
2. causing or communicating infection.
3. tending to spread from one to another:
infectious laughter.
4. Law.capable of contaminating with illegality; exposing to seizure or forfeiture.
5. Obs.diseased.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.