poison:1

noun
poi*son \ ˈpȯi-zᵊn \
13th century{ds||1|a|}
  • a substance that through its chemical action usually kills, injures, or impairs an organism
  • something destructive or harmful
  • an object of aversion or abhorrence

poison:2

verb
poison \
14th century{ds||1|a|}
  • to injure or kill with poison
  • to treat, taint, or impregnate with or as if with poison
  • to exert a baneful influence on : corrupt

poison:3

adjective
poison \
15th century{ds||1||}
  • poisonous, venomous
  • impregnated with poison : poisoned

poison dart frog

noun
poison dart frog \
1968
  • any of several small brightly colored frogs (family Dendrobatidae) of tropical Central and South America that produce poisonous secretions sometimes used by native peoples to poison dart or arrow tips —called also poison arrow frog

poison gas

noun
poison gas \
1816
  • a poisonous gas or a liquid or a solid giving off poisonous vapors designed (as in chemical warfare) to kill, injure, or disable by inhalation or contact

poison hemlock

noun
poison hemlock \
1757
  • a large European biennial poisonous herb (Conium maculatum) of the carrot family that is naturalized in the U.S. and has finely divided leaves and small white flowers

poison ivy

noun
poison ivy \
1782{ds||1|a|}
  • a climbing plant (Toxicodendron radicans synonym Rhus radicans) of the cashew family that is especially common in the eastern and central U.S., that has ternate leaves, greenish flowers, and white berries, and that produces an irritating oil causing a usually intensely itching skin rash
  • any of several plants closely related to poison ivy
  • a skin rash caused by poison ivy

poison oak

noun
poison oak \
1739{ds||1||}
  • any of several plants related to poison ivy and producing an oil with similar irritating properties: such as
  • a bushy plant (Toxicodendron diversilobum synonym Rhus diversiloba) of the Pacific coast
  • a bushy plant (Toxicodendron toxicarium synonym Rhus toxicodendron) chiefly of the southeastern U.S.

poison-pen

adjective
poi*son-pen \ ˈpȯi-zᵊn-ˈpen \
1911
  • written with malice and spite and usually anonymously

poison pill

noun
poison pill \
1983
  • a financial tactic or provision used by a company to make an unwanted takeover prohibitively expensive or less desirable
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