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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
pyrethrum is a noun meaning "made of dried flower heads of pyrethrum plants". It carries 4 recorded senses.
made of dried flower heads of pyrethrum plants
white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
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
used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for pyrethrum come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.