noun, plural e·chi·ni /-naɪ/ [-nahy] Show IPA .
any sea urchin of the genus Echinus.
2. Architecture. a.
an ovolo molding, especially one having an outline with several radii or one carved with an egg-and-dart pattern. See illus. under molding
the prominent circular molding supporting the abacus of a Doric or Tuscan capital.
c. Also called cymatium.
the circular molding, usually carved with an egg-and-dart pattern, forming part of an Ionic capital between the volutes and under the balteus.
1325–75; Middle English < Latin < Greek echînos hedgehog, sea urchin