rotenone \ro"te*none\, n.
A chemical substance ({C23H22O6}) extracted from the root of
the derris ({Derris elliptica}, {Derris malaccensis}, and
other species), used in treatment of scabies and as an
insecticide for external infestation by chiggers in human
medicine, and in veterinary medicine for the treatment of
infestations with fleas, ticks, and lice.
[PJC]