Contagious

a.	1.	(Med.) Communicable by contact, by a virus, or by a bodily exhalation; catching; as, a contagious disease.
	2.	Conveying or generating disease; pestilential; poisonous; as, contagious air.
	3.	Spreading or communicable from one to another; exciting similar emotions or conduct in others. His genius rendered his courage more contagious. - Wirt. The spirit of imitation is contagious. - Ames.

Adj.	1.	contagious - of or relating to communicable diseases; "by the road to the contagious hospital"
	2.	contagious - easily diffused or spread as from one person to another; "a contagious grin"
	3.	contagious - (of disease) capable of being transmitted by infection Synonyms: catching, communicable, contractable, transmissible, transmittable

assignable, catching, conductive, consignable, conveyable, deadly, destructive, endemic, envenomed, epidemial, epidemic, epiphytotic, epizootic, expressable, impartable, infective, inoculable, interchangeable, mailable, malign, malignant, mephitic, metathetic, miasmal, miasmatic, miasmic, movable, noxious, pandemic, pestiferous, pestilential, poisonous, portable, portative, removable, sporadic, spreading, taking, toxic, toxicant, toxiferous, transferable, transfusable, transmissible, transmissive, transmittable, transportable, transportative, transposable, venenate, veneniferous, venenous, venomous, zymotic