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in·fec·tious

infectious

 
 
pronunciation:
ihn fek shs
features:
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part of speech: adjective
definition 1: able to be given to others by infection.
We had to keep the cat by itself for six weeks because its disease was infectious.
synonyms:
communicable, contagious
similar words:
catching, septic, toxic
definition 2: spreading easily as though by infection.
He has such an infectious smile!
synonyms:
catching
similar words:
communicable, compelling, irresistible
derivations: infectiously (adv.), infectiousness (n.)
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  disease, virus