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poison oak a western North American shrub bearing leaves that often resemble oak leaves and secreting an oil that can cause a severe rash on contact. [2 definitions]
poisonous filled with or containing poison. [3 definitions]
poison-pen of a letter, note, or the like, containing invective, abuse, or threats designed to damage the reputation or happiness of the recipient, and usu. written anonymously.
poison pill a defensive measure taken by a corporation to prevent a takeover by making it too costly.
poison sumac a shrub native to swamps of eastern North America bearing pinnate leaves resembling those of sumac and clumps of grayish white berries and secreting an oil that causes a severe rash on contact.
poke to jab or prod, esp. with a slender or sharp object. [12 definitions]
poke bonnet a bonnet with a brim that projects out at the front.
poke fun at to tease or deride.
poker1 someone or something that pokes, esp. a long, pointed metal rod for stirring up a fire.
poker2 any of several card games that involve gambling on the value of the players' hands.
pokeweed a tall North American herb that has edible shoots, bears white flowers and deep purple berries, and has a poisonous root; pokeroot.
pokey variant of poky.
poky (informal) slow-moving. [2 definitions]
Poland a central European country on the Baltic Sea between Germany, Ukraine, and Belarus.
Poland China one of a North American breed of large black hogs with white markings.
polar of, pertaining to, or near one end of the axis of a spherical body, esp. the North Pole or South Pole of the earth. [3 definitions]
polar bear a large white bear that lives in arctic regions.
polar circle either the Arctic Circle or the Antarctic Circle.
polarimeter an instrument for measuring the degree of polarization of light. [2 definitions]
Polaris a variable binary star near the north celestial pole in the constellation Ursa Minor, having a magnitude of 2.1; North Star.
polariscope an instrument used to view, measure, or analyze polarized light, or through which to view things in polarized light.