Definitions for echinusɪˈkaɪ nəs
Random House Webster's College Dictionary
Ref: sea urchin.
the prominent convex circular molding supporting the abacus of the capital of a Doric column. any similar ovolo molding, often carved with an egg-and-dart pattern, as one on an Ionic capital.
Origin of echinus:
1325–75; ME < L < Gk echînos hedgehog, sea urchin
ovolo molding between the shaft and the abacus of a Doric column
a genus of echinoderms, including the common edible sea urchin of Europe
the rounded molding forming the bell of the capital of the Grecian Doric style, which is of a peculiar elastic curve. See Entablature
the quarter-round molding (ovolo) of the Roman Doric style. See Illust. of Column
a name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin