剧毒 (jùdú): highly toxic; extremely poisonous

Meanings

Zhè zhǒng mógu hányǒu jùdú.

This type of mushroom is highly toxic.

Shíyànshì lǐ cúnfàng zhe jùdú huàxuépǐn.

The laboratory stores highly toxic chemicals.

memory

剧 (extreme/intense) + 毒 (poison) — poison so intense it's deadly.

剧 jù

毒 dú