Definition of "echinus" in English

noun

1. A sea urchin.

2. (architecture) The rounded moulding forming the bell of the capital of the Grecian Doric style, which is of a peculiar elastic curve.

3. (architecture) The quarter-round moulding (ovolo) of the Roman Doric style.

4. (architecture) The egg-and-anchor or egg-and-dart moulding, because often identified with the Roman Doric capital.