1. Plural of pyrethrum; plants of the genus Chrysanthemum (or Tanacetum) with daisy-like flowers, native to southeastern Europe and western Asia.
Usage: Often used in botanical or horticultural contexts.
2. Plural of pyrethrum; an insecticidal powder or extract derived from pyrethrum flowers, used to kill insects.
Usage: Common in agriculture and pest control.

Examples

• The garden was filled with colorful pyrethrums blooming in late summer.
• Pyrethrums are valued for their natural insecticidal properties.
• She planted several varieties of pyrethrums along the border.
• Traditional pyrethrums were ground into powder for use against household pests.
• The farmer applied pyrethrum extract to protect the crops from aphids.