What is (a) A stone placed on the impost of a pier for receiving the first stone of an arch. (b) That part of the Ionic capital between the abacus and quarter round, which forms the volute. Gwilt called?

coussinet — (a) A stone placed on the impost of a pier for receiving the first stone of an arch. (b) That part of the Ionic capital between the abacus and quarter round, which forms the volute. Gwilt. (Webster's 1913.)

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