1. Extremely small, hollow cylindrical structures made of carbon atoms, typically a few nanometers in diameter, used in materials science and nanotechnology.
Usage: Usually used in plural form; Technical/scientific term; Often refers to carbon nanotubes specifically

Examples

• Scientists are developing nanotubes for use in stronger, lighter materials.
• Carbon nanotubes have exceptional electrical and thermal properties.
• Researchers hope nanotubes will revolutionize electronics and medicine.
• The nanotubes were observed under an electron microscope.
• Nanotubes could be used to create more efficient solar panels.
• The strength-to-weight ratio of nanotubes makes them valuable for aerospace applications.