(medicine) A disease occasioned or aggravated by overcrowding, especially due to lack of ventilation.

plural of poison pill

Any of the species of Toxicodendron with compound leaves having three oak-like leaflets, native to North America.

A poisonous gas. / (military) Any poisonous gas used as a chemical weapon.

plural of poisoned pawn

(chess) An unprotected pawn whose capture would be a losing move for the capturing player.

The European hemlock Conium maculatum, an extremely poisonous plant in the carrot family, Apiaceae / (uncountable) A lethally poisonous drink made from the plant.

(idiomatic) Something which is initially regarded as advantageous but which is later recognized to be disadvantageous or harmful; an apparently beneficial or benign instrument or scheme for causing death or harm.

A high blood level of alcohol, toxic enough to injure or kill a person.

The tree Comocladia dodonaea, whose exudate can cause contact dermatitis.