Pyrethroid is a type of chemical that is used in insecticides. It is derived from the chrysanthemum flower and is very effective in killing bugs and pests. Full definition
In the new study, 5,046 urine samples collected from U.S. adults and children between 1999 and 2002 were tested for five metabolites of pyrethroid insecticides. (scientificamerican.com)
Regarding Ried Nelson's entry — the combination of pyrethroid insecticides and associated chemical adjuvants like piperonyl butoxide are not entirely harmless, especially to beneficial insects, children, aquatic organisms and cats. (greenbuildingadvisor.com)
After cleaning, the entire cage should be sprayed with pyrethroid spray. (safarivet.com)