oocyte

oocyte
The immature ovum. SYN: ovocyte. [G. oon, egg, + kytos, a hollow (cell)]
- primary o. an o. during its growth phase and before it completes the first maturation division.
- secondary o. an o. in which the first meiotic division is completed; the second meiotic division usually stops short of completion unless fertilization occurs.

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oo·cyte 'ō-ə-.sīt n an egg before maturation: a female gametocyte called also ovocyte

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n.
a cell in the ovary that undergoes meiosis to form an ovum. Primary oocytes develop from oogonium in the fetal ovary as they enter the early stages of meiosis. Only a fraction of the primary oocytes survive until puberty, and even fewer will be ovulated. At ovulation the first meiotic division is completed and a secondary oocyte and a polar body are formed. Fertilization stimulates the completion of the second meiotic division, which produces a second polar body and an ovum.

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oo·cyte (oґo-sīt) [oo- + -cyte] the immature female reproductive cell prior to fertilization, derived from an oogonium and occurring in two stages, primary and secondary oocytes.

Medical dictionary. 2011.

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  • oocyte — The egg mother cell; it undergoes two meiotic divisions (oogenesis) to form the egg cell. The primary oocyte refers to the state before completion of the first meiotic division; the secondary oocyte after completion of the first meiotic division …   Glossary of Biotechnology

  • oocyte — /oh euh suyt /, n. Cell Biol. an immature egg cell of the animal ovary; in humans, one oocyte matures during the menstrual cycle, becoming an ootid and then an ovum, while several others partially mature and then disintegrate. [1890 95; OO +… …   Universalium

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  • oocyte — o•o•cyte [[t]ˈoʊ əˌsaɪt[/t]] n. cbl an immature egg cell of the animal ovary: in humans, one oocyte matures during the menstrual cycle while several others partially mature and disintegrate • Etymology: 1890–95 …   From formal English to slang

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