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Definition of infectious:

  1. Capable of being easily diffused or spread; sympathetic; readily communicated; as, infectious mirth.
  2. Contaminating with illegality; exposing to seizure and forfeiture.
  3. Corrupting, or tending to corrupt or contaminate; vitiating; demoralizing.
  4. Having qualities that may infect; communicable or caused by infection; pestilential; epidemic; as, an infectious fever; infectious clothing; infectious air; infectious vices.


pathogenic, transmissible, communicable, transmittable, taking, morbific, dangerous, corrupting, septic, move, contractable, contagious, infective, irresistible, catching, contaminating.

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