oogonium noun. [ǝʊǝ'gǝʊnɪǝm] Pl. -nia [-nɪǝ]. M19.
[from OO- + Greek gonos generation: see -IUM.]
1. Botany. The female gametangium of certain algae, fungi, etc., usu. a rounded cell or sac containing one or more oospheres. M19.

2. Biology. A primordial female reproductive cell that gives rise to primary oocytes by mitosis. L19.

■ oogonial adjective E20.

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