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Webster's New World College Dictionary » contagious
contagious 
contagious definition
con·ta·gious (-jəs)
adjective
- spread by direct or indirect contact; communicable: said of diseases
- carrying, or liable to transmit, the causative agent of a contagious disease
- for the care of contagious patients
- spreading or tending to spread from person to person contagious laughter
Etymology: OFr contagieus < LL contagiosus
Related Forms:
- contagiously con·ta′·giously adverb
- contagiousness con·ta′·gious·ness noun
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