pyrethrin

名词 n.
中文释义

英文释义

名词 n.
  1. Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.
    — Ecoparasite control, with appropriate concentrations of carbaryl, malathion, or pyrethrin dusts, is permissible if the agent is applied externally to both test and control animals not less than seven days prior to the start of the test.

词形变化

pyrethrins plural

词源

Etymology tree
English pyrethrum
Proto-Indo-European *-nós
Proto-Indo-European *-iHnos
Proto-Italic *-īnos
Latin -īnusder.
Old French -inbor.
Middle English -in
English -ineclip.
English -in
English pyrethrin
From pyrethrum + -in.
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