infectious
adjective
in·fec·tious
in-ˈfek-shəs
1
a
: producing or capable of producing infection
bacteria and other infectious agents
b
: caused by or resulting from an infection with one or more pathogenic agents
infectious mononucleosis
see also infectious disease
c
: transmitting or capable of transmitting infection : containing pathogenic agents which may be transmitted
infectious droplets
2
: spreading or capable of spreading rapidly to others
an infectious laugh
Her happiness was infectious.
infectiously
adverb
infectiousness
noun
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Merriam-Webster unabridged
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