pyrethrum

(pir'eth-rum) [G. pyrethron, feverfew.] (U.S.) Pyrethri radix (Br.), pellitory, Spanish chamomile, the root of An a cyclus pyrethrum, a shrub native of Morocco; increases the flow of saliva and is employed in atonic pharyngitis and elongated uvula as a masticatory in doses of gr. 30-60 (2.0-4.0). Ger'man p., the root of An a cyclus of ficin arum, cultivated chiefly in Germany; employed as a substitute for the official pyrethrum. pyr'ethri flo'res, Persian insect powder, pulvis insect i cid us; the dried and powdered partly expanded flower heads of Chrysanthemum roseum and of C. cinerariifolium, yielding the Persian and the Dalmation insect powder, respectively, pyr'ethri ra'dix (Br.), pellitory root, pyrethrum (U.S.).