Alkaloid (noun)

A bitter-tasting organic base found in many plants, especially those in the nightshade family, and having physiological effects on humans and animals.

Origin:

Late 19th century: from german alkaloid, from alkali (see alkali) + -oid.

Examples:

1. Morphine is an alkaloid found in opium.
2. The alkaloids found in this plant have medicinal properties.
3. Caffeine is an alkaloid found in coffee and tea.
4. The alkaloids in this plant are toxic to animals.
5. The alkaloids in this plant have been used for centuries in traditional medicine.