Lethal Dose Low. The lowest dose of a substance introduced by any route, other than inhalation, over any given period of time in one or more divided portions and reported to have caused death in humans or animals.

Lethal dose, low. The lowest dose which causes death in test animals.

Lethal dose low. The lowest dose (other than LD50) of a substance introduced by any route other than inhalation that has caused death.