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Related to primary oocyte: secondary oocyte
an oocyte during its growth phase and before it completes the first meiotic division.
an oocyte that has begun but not completed the first maturation division. It is derived from an oogonium by differentiation near the time of birth.
pri·mar·y o·o·cyte(prī'mar-ē ō'ō-sīt)
An oocyte during its growth phase and before it completes the first maturation division.