summer squash

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

• noun Any of several varieties of squash (Cucurbita pepo), such as the crookneck or zucchini, that are eaten before they ripen and develop a hard rind.

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

• noun any of various usually bushy plants producing fruit that is eaten while immature and before the rind or seeds harden
• noun any of various fruits of the gourd family that mature during the summer; eaten while immature and before seeds and rind harden