a shrub or small tree, Rhus vernix (or Toxicodendron vernix), of swampy areas of the eastern U.S., having pinnate leaves and causing severe dermatitis when touched by persons sensitive to it.

poison sumac n.
A swamp shrub of the southeast United States, having compound leaves and greenish-white berries and causing an itching rash on contact with the skin.


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  • Poison sumach

    noun 1. an anacardiaceous swamp shrub, Rhus (or Toxicodendron) vernix of the southeastern US, that has greenish-white berries and causes an itching rash on contact with the skin Also called poison dogwood, poison elder See also sumach

  • Poisonwood

    [poi-zuh n-woo d] /ˈpɔɪ zənˌwʊd/ noun 1. a tree, Metopium toxiferum, of southern Florida, that has compound leaves and yellowish, berrylike fruits and is poisonous to touch.

  • Poisson

    /French pwasɔ̃/ noun 1. Siméon Denis (simeɔ̃ dəni). 1781–1840, French mathematician, noted for his application of mathematical theory to physics, esp electricity and magnetism

  • Poisson-distribution

    [pwah-sohn; French pwa-sawn] /pwɑˈsoʊn; French pwaˈsɔ̃/ noun, Statistics. 1. a limiting form of the binomial probability distribution for small values of the probability of success and for large numbers of trials: particularly useful in industrial quality-control work and in radiation and bacteriological problems. /ˈpwɑːsən/ noun 1. (statistics) a distribution that represents the number of events […]

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