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Pronunciation:  in'fekshus

WordNet Dictionary
  1. [adj]  easily spread; "fear is exceedlingly infectious; children catch it from their elders"- Bertrand Russell
  2. [adj]  caused by infection or capable of causing infection; "viruses and other infective agents"; "a carrier remains infective without himself showing signs of the disease"

INFECTIOUS is a 10 letter word that starts with I.


 Synonyms: catching, communicable, contagious, contaminating, contractable, corrupting, infective, septic, transmissible, transmittable
 Antonyms: noninfectious



Webster's 1913 Dictionary
\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

         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}.

Medical Dictionary
 Definition: Ability to transmit a disease caused by microorganisms.
Thesaurus Terms
 Related Terms: catching, communicable, contagious, deadly, destructive, endemic, envenomed, epidemial, epidemic, epiphytotic, epizootic, infective, inoculable, irresistible, malign, malignant, mephitic, miasmal, miasmatic, miasmic, noxious, pandemic, pestiferous, pestilent, pestilential, poisonous, sporadic, spreading, sympathetic, taking, toxic, toxicant, toxiferous, transmissible, venenate, veneniferous, venenous, venomous, virulent, zymotic