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pessimistic tending to expect unfavorable outcomes. [2 definitions]
pest someone or something that annoys or bothers; nuisance. [3 definitions]
pester to bother continually or repeatedly about what are felt to be petty matters; annoy.
pesthole a place that is infested or likely to become infested with epidemic disease.
pesticide a chemical substance used to kill pests, esp. insects that harm crops.
pestiferous bringing, bearing, or breeding infectious disease; pestilential. [2 definitions]
pestilence an epidemic, usu. deadly, disease; plague. [2 definitions]
pestilent causing or tending to cause epidemic disease or death; pestilential or fatal. [3 definitions]
pestilential of, causing, or resembling a pestilence; pestilent. [2 definitions]
pestle a hand-held implement for grinding or pounding substances into powder, usu. in a mortar. [3 definitions]
pesto a sauce of ground fresh basil, pine nuts, garlic, and grated Parmesan cheese mixed with olive oil and served over pasta.
pet1 an animal, usu. domesticated or tamed, kept in one's home for companionship rather than practical use. [7 definitions]
pet2 a sulky mood or fit of temper; peeve; petulance.
petal one of the separate, modified leaves, usu. of a different color from the plant's other leaves, that form the outer part of a flower head.
petard an explosive device formerly used in warfare to breach a defensive fortification.
petcock a small valve or faucet used to drain from or lower the pressure in a pipe, boiler, steam engine, or the like.
Peter one of the twelve Apostles of Jesus Christ and a leader in the establishment of the Christian church, often considered the first pope. [2 definitions]
peter (informal) to dwindle gradually to the point of stopping or disappearing altogether (usu. fol. by out).
Peter Pan the title character of J.M. Barrie's early twentieth-century play, a young boy who never grows up.
Peter Paul Rubens a Flemish painter (b.1577--d.1640).
Peter Principle the satiric idea that employees of large organizations tend to be promoted until they reach the level at which they are incompetent.