noun, plural o·o·go·ni·a [oh-uhgoh-nee-uh] /ˌoʊ əˈgoʊ ni ə/, o·o·go·ni·ums. Biology.

  1. one of the undifferentiated germ cells giving rise to oocytes.
  2. the one-celled female reproductive organ in certain thallophytes, usually a more or less spherical sac containing one or more eggs.

noun plural -nia (-nɪə) or -niums

  1. an immature female germ cell forming oocytes by repeated divisions
  2. a female sex organ of some algae and fungi producing female gametes (oospheres)

n. pl. o•o•go•ni•ums

  1. The primitive egg mother cell from which the oocytes develop.

Plural oogonia oogoniums

  1. A female reproductive structure in certain algae and fungi. It is usually a rounded cell or sac containing one or more oospheres.
  2. A cell that arises from a primordial germ cell and differentiates into an oocyte in the ovary of female animals.

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