[pahy-ree-thruh m, -reth-ruh m] /paɪˈri θrəm, -ˈrɛθ rəm/
any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental.
any of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
Pharmacology. the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.
any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers
any insecticide prepared from the dried flowers of any of these plants, esp C. roseum
pyreto- pref. Fever: 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 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.
[pir-i-toh-ther-uh-pee, pahy-ri-] /ˌpɪr ɪ toʊˈθɛr ə pi, ˌpaɪ rɪ-/ noun, Medicine/Medical. 1. therapy by raising the body temperature, as by diathermy or by artificially inducing fever.