From The Collaborative International Dictionary of English v.0.48:
Scaly \Scal"y\, a. 1. Covered or abounding with scales; as, a scaly fish. "Scaly crocodile." --Milton. [1913 Webster]
2. Resembling scales, laminae, or layers. [1913 Webster]
3. Mean; low; as, a scaly fellow. [Low] [1913 Webster]
4. (Bot.) Composed of scales lying over each other; as, a scaly bulb; covered with scales; as, a scaly stem. [1913 Webster]
Scaly ant-eater (Zool.), the pangolin. [1913 Webster]