A hedgehog.

A shell-fish set with prickles or spines. The Echinus, in natural history, forms a genus of Mollusca. The body is roundish, covered with a bony crust, and often beset with movable prickles. There are several species and some of them eatable.

With botanists, a prickly head or top of a plant; an echinated pericarp.

In architecture, a member or ornament near the bottom of lonic, Corinthian or Composite capitals, so named from its roughness, resembling, in some measure, the spiny coat of a hedgehog.