coussinet

from The Century Dictionary.

• noun In architecture, a member of the Ionic capital between the abacus and the echinus.
• noun In an Ionic capital, a roll or baluster-shaped member which is carried horizontally from one volute to another. There are two in each capital. See cut at *collarino.

from the GNU version of the Collaborative International Dictionary of English.

• noun A stone placed on the impost of a pier for receiving the first stone of an arch.
• noun That part of the Ionic capital between the abacus and quarter round, which forms the volute.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture A stone placed on the impost of a pier for receiving the first stone of an arch.
• noun architecture Part of the Ionic capital between the abacus and quarter round, which forms the volute.