mesocarp

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

• noun The middle, usually fleshy layer of a fruit wall.

from The Century Dictionary.

• noun In botany, the middle layer of a pericarp when it is possible to distinguish three dissimilar layers; the sarcocarp.

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

• noun (Bot.) The middle layer of a pericarp which consists of three distinct or dissimilar layers.

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

• noun botany The middle layer of the pericarp of a fruit. In many fruits such as drupes and tomatoes, the mesocarp is fleshy.

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

• noun the middle layer of a pericarp