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plural echinuses or echini
A sea urchin. quotations examples
'It is a sea-urchin - a common echinus. Nature repeats itself in many forms regardless of the size. This echinus is a model, a prototype, of the world.'
1929, Sir Arthur Conan Doyle, When the World Screamed
(architecture) The rounded moulding forming the bell of the capital of the Grecian Doric style, which is of a peculiar elastic curve. examples
(architecture) The quarter-round moulding (ovolo) of the Roman Doric style. examples
(architecture) The egg-and-anchor or egg-and-dart moulding, because often identified with the Roman Doric capital. examples