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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.
pest-resistant of or pertaining to a plant variety that has higher than normal tolerance to one or more pests, used esp. in reference to plants that have been genetically modified for the purpose of increasing tolerance to pests.
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.
pet-friendly allowing or catering to pets.
petiole the thin stalk by which a leaf is attached to a stem. [2 definitions]
petit less serious or important in law; minor.
petit bourgeois of the lower middle class, esp. in a capitalist society.