Etymology
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infective (adj.)

"infectious, communicable by infection," late 14c., from Latin infectivus, from infect-, past participle stem of inficere "to tinge, dye; stain, spoil" (see infect).

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Definitions of infective

infective (adj.)
able to cause disease;
infective agents
Synonyms: morbific / pathogenic
infective (adj.)
caused by infection or capable of causing infection;
a carrier remains infective without himself showing signs of the disease
viruses and other infective agents
Synonyms: infectious
From wordnet.princeton.edu