ˈled- noun
: an arsenate of lead: as
a. : a crystalline acid salt PbHAsO 4 made usually by reaction of lead monoxide with arsenic pentoxide and used as an insecticide; di-lead orthoarsenate — called also acid lead arsenate, standard lead arsenate
b. : a mixture of basic orthoarsenates of lead used as an insecticide especially on sensitive plants — called also basic lead arsenate