名詞 pyrethrum:

1. made of dried flower heads of pyrethrum plants
2. white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
   同義詞：Dalmatian pyrethrum, Dalmatia pyrethrum, Tanacetum cinerariifolium, Chrysanthemum cinerariifolium
3. spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum
   同義詞：painted daisy, Tanacetum coccineum, Chrysanthemum coccineum
4. used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
   同義詞：genus Pyrethrum

py.re.thrum

n.（名詞）
Any of several Old World plants of the genusChrysanthemum, such as C. coccineum, cultivated for their showy flower heads.
菊花：一種東半球菊科 屬植物，例如 紅花除蟲菊 ，因醒目的花朵而被種植
An insecticide made from the dried flower heads ofChrysanthemum cinerariifolium or C. coccineum.
除蟲菊殺蟲劑：由除蟲菊 或 紅花除蟲菊 的干燥的花朵制成的殺蟲藥劑

來源：
Latin [pellitory]
拉丁語 [墻草屬植物]
from Greek purethron [feverfew]
源自 希臘語 purethron [小白菊]
from pur [fire (from its warming effect)] * see pyretic
源自 pur [火（不自它的加溫效果）] *參見 pyretic