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polar body


Definition: one of two small cells formed by the first and second meiotic division of oocytes; the first is usually released just before ovulation, the second not until discharge of the oocyte from the ovary; in mammals, the second polar body may fail to form unless the oocyte has been penetrated by a sperm.

Synonym(s): polar cell, polar globule, polocyte

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.