The Collaborative International Dictionary
Coussinet
Coussinet \Cous"si*net`\ (k??s"s?-n?t`), n. [F., dim. of coussin cushion. See Cushionet.] (Arch.)
A stone placed on the impost of a pier for receiving the first stone of an arch.
That part of the Ionic capital between the abacus and quarter round, which forms the volute.
--Gwilt.
Wiktionary
coussinet
n. 1 (context architecture English) A stone placed on the impost of a pier for receiving the first stone of an arch. 2 (context architecture English) Part of the Ionic capital between the abacus and quarter round, which forms the volute.