Scaly means covered with scales, the small, flat, overlapping pieces that protect the skin of fish, snakes, lizards, and other reptiles. If you've ever touched a snake or caught a fish, you know that scaly feeling: smooth in one direction, slightly rough in the other, like tiny armor plates fitted together.

Scales serve as protection, kind of like how knights wore metal plates or how shingles overlap on a roof. A fish's scaly skin shields it from injuries and parasites as it swims through rocky waters. A lizard's scales help it survive in harsh, hot deserts.

The word also describes skin that looks or feels like it has scales, even when it doesn't. When people have very dry skin, they might call it scaly because it flakes and cracks in a pattern that resembles reptile scales. You might notice your hands getting scaly in winter when the cold, dry air pulls moisture from your skin.

In fantasy stories, dragons are almost always described as having scaly hides that arrows can't pierce. And in the real world, pangolins are mammals covered in hard, scaly armor that protects them from predators, making them look more like walking pinecones than typical furry animals.