Oogonium(redirected from Oögonia)
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the female sex organ (gametangium) of many lower plants that are characterized by oogamy. A single egg cell develops in the oogonium. Several egg cells rarely develop, for example, in Cyclosporeae brown algae. The oogonium is usually unicellular; less frequently, is it multicellular, for example, in Charophyta algae.