echinus

noun
echi·​nus | \i-ˈkī-nəs \
plural echini\ i-​ˈkī-​ˌnī \

Definition of echinus 

2a : the rounded molding that lies directly beneath the abacus in the capital of a column in the Greek Doric order

b : a similar member in other orders

First Known Use of echinus

14th century, in the meaning defined at sense 1

History and Etymology for echinus

Middle English, from Latin, from Greek echinos hedgehog, sea urchin — more at ophite

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The first known use of echinus was in the 14th century

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