Definition of oogonium in English:

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oogonium

Pronunciation: /ˌəʊəˈɡəʊnɪəm/

noun (plural oogonia)

1 Botany The female sex organ of certain algae and fungi, typically a rounded cell or sac containing one or more oospheres.
Example sentences
  • ‘Oomycota’ means ‘egg fungi,’ and refers to the large round oogonia, or structures containing the female gametes, as shown in this picture of the common ‘water mold’ Saprolegnia.
  • The parent also contains antheridia which produce sperm and an oogonium which produces the egg.
  • Further comparison might be made between the stalked and vase-shaped vesicles found on some fossil cells with the oogonia of certain living Vaucheria species.
2 Biology An immature female reproductive cell that gives rise to primary oocytes by mitosis.
Example sentences
  • In most crustaceans, the production of primary oocytes derived from oogonia continues throughout adult life.
  • The oogonia multiply by mitosis, but early in fetal life, they enter meiosis.
  • In the case of developing eggs, the diploid oogonia continue to divide mitotically for a short time in the ovary.

Origin

Mid 19th century: from oo- 'of an egg' + Greek gonos 'generation' + -ium.

For editors and proofreaders

Line breaks: oo|go¦nium

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