primary oocyte

https://doi.org/10.1351/goldbook.11041

Oocyte during growth phase before completion of the first meiotic division.

Note: The primary oocyte is diploid and becomes a secondary oocyte before birth.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 787 [Terms] [Paper]