"infectious" in the adjective sense
1. infectious, infective
caused by infection or capable of causing infection
"viruses and other infective agents"
"a carrier remains infective without himself showing signs of the disease"
2. infectious
easily spread children catch it from their elders"- Bertrand Russell
"fear is exceedingly infectious
3. infectious
of or relating to infection
"infectious hospital"
"infectious disease"
Source: WordNet® (An amazing lexical database of English)
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