adj. 1. a. Producing or breeding infectious disease. b. Infected with or contaminated by an epidemic disease. 2. Morally evil or deadly; pernicious. 3. Bothersome; annoying. [Middle English, from Latin pestiferus, variant of pestifer : pestis, pestilence; see PEST + -fer, -fer.] pes·tifer·ous·ly adv. pes·tifer·ous·ness n. |
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