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Definition of echinus
echini
play \i-ˈkī-ˌnī\1 : sea urchin
2a : the rounded molding that lies directly beneath the abacus in the capital of a column in the Greek Doric orderb : a similar member in other orders
From the M-W Editors
Origin and Etymology of echinus
Middle English, from Latin, from Greek echinos hedgehog, sea urchin — more at ophite
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