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Wordswarms From Years Past


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Adjacent Words

pyrectic
Pyrena
Pyrenae
pyrene
Pyrenean
Pyrenees
Pyrenees daisy
Pyrenite
pyrenoid
Pyrenomycetes
pyrethrin
Pyrethrine
pyrethroid
Pyrethrum camphor
Pyrethrum or Chrysanthemum Parthenium
pyretic
Pyretology
Pyrex
pyrexia
Pyrexiae
pyrexial
pyrexic
Pyrexical
Pyrgom

pyrethrum definitions

WordNet (r) 3.0 (2005)

n
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 [syn: pyrethrum, 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 [syn: painted daisy, pyrethrum, Tanacetum coccineum, Chrysanthemum coccineum]
4: used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum [syn: Pyrethrum, genus Pyrethrum]

Merriam Webster's

noun Etymology: Latin, pellitory, from Greek pyrethron, from pyr fire Date: circa 1543 1. any of several chrysanthemums with finely divided often aromatic leaves including ornamentals as well as important sources of insecticides 2. an insecticide made from the dried heads of any of several Old World chrysanthemums (especially Chrysanthemum cinerariaefolium)

Oxford Reference Dictionary

n. 1 any of several aromatic chrysanthemums of the genus Tanacetum, esp. T. coccineum. 2 an insecticide made from the dried flowers of these plants, esp. Tanacetum cinerariifolium. Etymology: L f. Gk purethron feverfew



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