Coussinet

Cous″si‐net′ (k??s″s?–n?t′), n. [F., dim. of coussin cushion. See Cushionet.] (Arch.) (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.