denticle

Everyday

1. (science) One of the tiny tooth-like scales that cover the skin of sharks and rays, making it feel rough like sandpaper; also called «dermal denticles». tree →
2. Any small tooth or tooth-shaped bump, for example on a leaf edge, insect leg or shell. tree →

In the lessons

In science lessons on sea animals and adaptation, shark skin is covered in denticles that point backwards; they reduce drag, help sharks swim fast and quietly, and stop barnacles and algae sticking. Engineers copied them (biomimicry) for swimsuits, boat hulls and hospital surfaces. Phrases: «dermal denticles», «shark denticles».

Examples

• Shark skin is covered in tiny denticles. tree →
• Stroke a shark from tail to head and the denticles feel like sandpaper. tree →
• Denticles help sharks glide through the water. tree →
• Scientists copied shark denticles to make faster swimsuits. tree →
• Each denticle is built like a tiny tooth. tree →
• Under the microscope, the denticles looked like little ridged shields. tree →

Note

Said «DEN-tih-kul». Plural: denticles. It comes from Latin «dens», tooth (as in «dentist»). Fun fact: a shark's denticles are made of the same materials as teeth (enamel-like outer layer and dentine), not the same as fish scales.