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The Collaborative International Dictionary
Coussinet

Coussinet \Cous"si*net`\ (k??s"s?-n?t`), n. [F., dim. of coussin cushion. See Cushionet.] (Arch.)

  1. A stone placed on the impost of a pier for receiving the first stone of an arch.

  2. 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.