picloram

[pik-luh-ram, pahy-kluh-]

noun Chemistry.

a colorless powder, C6H3Cl3N2O2, used as a systemic herbicide for controlling annual weeds and deep-rooted perennials on noncrop land.

Origin of picloram

1960–65; reverse compound from am(inotrich)lor(o)pic(olinic acid); see amino-, tri-, chloro-², picolinic