WordReference Random House Unabridged Dictionary of American English © 2025
in•fec•tive  (in fek′tiv),USA pronunciation adj. 
  1. infectious.
  • Medieval Latin infectīvus. See infect, -ive
  • Middle English 1350–1400
in•fec′tive•ness, in′fec•tiv′i•ty, n. 


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