(1) the kernel of certain grains such as wheat; (2) small, juicy fruits that grow on vines and bushes (3) Botanically,a berry is a fleshy fruit produced from a single ovary, such as a grape. The seeds are usually embedded in the flesh of the ovary.
Definitions 1 and 2 from LABENSKY, SARAH R.; HAUSE, ALAN M.; LABENSKY, STEVEN R.; MARTEL, PRICILLA, ON COOKING: A TEXTBOOK OF CULINARY FUNDAMENTALS, 4th Edition, ©2007. Electronically reproduced by permission of Pearson Education, Inc., Upper Saddle River, New Jersey.
Definition 3 from Wikipedia. See berry.