noun
- small flatworms that live in freshwater and are known for their ability to regenerate lost body parts
Usage: biology; plural form of planarian
Examples
- The students observed planarians under the microscope during biology class.
- Planarians can regenerate their entire head if it is cut off.
- Scientists study planarians to understand how regeneration works.
- The pond water contained several species of planarians.
- Planarians are popular subjects for research on stem cells.
- When a planarian is cut in half, both pieces can grow into complete worms.
- The laboratory keeps cultures of planarians for educational purposes.