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[pahy-ree-throid, -reth-roid] /paɪˈri θrɔɪd, -ˈrɛθ rɔɪd/

noun, Chemistry.
any of several synthetic compounds that are similar to but more persistent than natural .
any of various chemical compounds having similar insecticidal properties to pyrethrin
of or relating to such compounds


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  • Pyrethrum

    [pahy-ree-thruh m, -reth-ruh m] /paɪˈri θrəm, -ˈrɛθ rəm/ noun 1. any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental. 2. any of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides. 3. Pharmacology. the dried flower […]

  • Pyreto-

    pyreto- pref. Fever: pyretogenesis.

  • Pyretogenesis

    pyretogenesis py·re·to·gen·e·sis (pī’rĭ-tō-jěn’ĭ-sĭs, pĭr’ĭ-) n. The origin and mode of production of fever. py’re·to·ge·net’ic (-jə-nět’ĭk) adj.

  • Pyretogenic

    pyretogenic py·re·to·gen·ic (pī’rĭ-tō-jěn’ĭk, pĭr’ĭ-) or pyr·e·tog·e·nous (pī’rĭ-tŏj’ə-nəs, pĭr’ĭ-) adj. Pyrogenic.

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