polar body

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

• noun Either of two small cells produced during the first and second meiotic divisions in the development of an oocyte, containing little cytoplasm and eventually degenerating.

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

• noun biology One of the small cells that are by-products of the meiosis that forms an egg.

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

• noun a small cell containing little cytoplasm that is produced along with the oocyte and later discarded