simple fruit

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

• noun A fruit, such as a pea pod, orange, or tomato, that develops from a single pistil.

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

• noun botany A fruit that develops from either a single or compound ovary within a flower with a single pistil.

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

• noun an indehiscent fruit derived from a single ovary having one or many seeds within a fleshy wall or pericarp: e.g. grape; tomato; cranberry