cypsela

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An achene fruit derived from an inferior ovary, characteristic of plants in the composite family.

from The Century Dictionary.

• noun In botany, an achene with an adnate calyx, as in the Compositœ.

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

• noun (Bot.) A one-seeded, one-celled, indehiscent fruit; an achene with the calyx tube adherent.

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

• noun botany An achene formed from a double ovary, especially in plants of the family Compositae