Nightshade (noun)

1. A type of poisonous plant.
2. A family name of plants (Solanaceae) including many poisonous and many edible species.

Origin:

The word 'nightshade' comes from the old english word 'nihtesceade' meaning 'shade-producing plant of the night'. it is used to refer to a type of poisonous plant and also as a family name of plants.

Examples:

1. The nightshade plant is known for its toxic berries which can be deadly if consumed.
2. The nightshade family includes the plants from which important medicines such as atropine and solanine are obtained.
3. The nightshade plant has been used for thousands of years for both medicinal and poisonous purposes.
4. Eating unripe nightshade berries can lead to serious illness, as they contain solanine, a toxic substance.
5. The nightshade plant is a common ingredient in traditional medicine, and is used to treat a variety of ailments.