Several of the species are extremely poisonous, the active poison being oenanthotoxin.

These attractive red to orange berries are extremely poisonous.

All parts, including the seeds and berries, are extremely poisonous.

Plutonium is extremely poisonous and has a half-life of 24,000 years.

Mercury is extremely poisonous and has to be used carefully.

Diclofenac is a compound now known to be extremely poisonous to vultures.

I have heard that carbon monoxide is extremely poisonous.

Mercuric nitrate is extremely poisonous and may be absorbed through the skin.

They said we have a Constitutional right to privacy in our homes, under which fits the possession of an extremely poisonous alcohol.

The bean, though extremely poisonous, is used for medicines.