Usually means: Natural insecticide derived from chrysanthemums.
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We found 24 dictionaries that define the word pyrethrum:

General (16 matching dictionaries)
  1. pyrethrum: Merriam-Webster
  2. Pyrethrum, pyrethrum: Oxford Learner's Dictionaries
  3. pyrethrum: American Heritage Dictionary of the English Language
  4. pyrethrum: Collins English Dictionary
  5. Pyrethrum, pyrethrum: Vocabulary.com
  6. Pyrethrum, pyrethrum: Wordnik
  7. pyrethrum: Wiktionary
  8. pyrethrum: Webster's New World College Dictionary, 4th Ed.
  9. pyrethrum: The Wordsmyth English Dictionary-Thesaurus
  10. pyrethrum: Infoplease Dictionary
  11. pyrethrum: Dictionary.com
  12. Pyrethrum: Wikipedia, the Free Encyclopedia
  13. Pyrethrum: Rhymezone
  14. pyrethrum: FreeDictionary.org
  15. pyrethrum: Mnemonic Dictionary
  16. pyrethrum: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. pyrethrum: Encyclopedia

Medicine (3 matching dictionaries)
  1. pyrethrum: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. pyrethrum: Medical dictionary

Science (3 matching dictionaries)
  1. pyrethrum: Dictionary of Botanical Epithets
  2. Pyrethrum: Botanical Name listing of Plants
  3. Garden Flower, Shrub and Tree Glossary (No longer online)

Tech (1 matching dictionary)
  1. Book Binding (No longer online)

(Note: See pyrethrums as well.)

Definitions from Wiktionary (pyrethrum)

noun:  Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium.
noun:  Anacyclus pyrethrum (pellitory of Spain)
noun:  (organic chemistry) Any of several insecticides obtained from these plants; pyrethrin.

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