They produce oxygen as a waste product, a normally lethal poison to the plant cell.

The first thing to emerge from the ocean is a lethal poison.

The very first is the lethal poison known as Halahala.

A scalpel, a hat pin, a bit of lethal poison.

Had that aerosol been a knockout drug, or a lethal poison?

The materials necessary for suicide by hanging are easily available to the average person, compared with firearms or lethal poison.

"If a lethal poison was in my tea, would you know it?"

Some sort of paralyzing drug, then, rather than a lethal poison.

He supervised preparations of lethal poisons and experiments in mind control.

They hunt wild animals using spears with a lethal poison at the tip.