Megasporangium definitions

mĕg'ə-spə-răn'jē-əm
A structure in which megaspores are formed.
noun
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A sporangium, or spore case, containing only megaspores, as in some ferns.
noun
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A plant structure in which megaspores are formed, such as those of the female cones of pines.
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(biology) A sporangium which produces only megaspores.
noun
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Origin of megasporangium

From neo-Latin, from mega- 'major' (from Ancient Greek (megas) 'great') + sporangium (from spora + Greek (angeion) 'vessel')