accessory fruit

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

• noun A fruit, such as the pear or strawberry, that develops from a ripened ovary or ovaries but includes a significant portion derived from nonovarian tissue.

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

• noun botany A fruit which includes tissue not derived from the ovary but from some adjacent tissue, as for instance, a strawberry.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry