secondary oocyte n an oocyte that is produced by division of a primary oocyte in the first meiotic division
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an oocyte in the period between the first and second maturation division; it is derived from a primary oocyte shortly before ovulation by a division that splits off the first polar body. If fertilized, it divides into an ootid and the second polar body; otherwise it perishes. In humans, it is a round cell about 0.1 mm in diameter, and consists of protoplasm that contains some yolk, enclosed by a thin cell wall, the vitelline membrane. It is surrounded by the zona pellucida and corona radiata.Medical dictionary. 2011.