megasporangia

megasporangium

[meg-uh-spaw-ran-jee-uhm, -spoh-]
noun, plural megasporangia [meg-uh-spaw-ran-jee-uh, -spoh-] . Botany.
a sporangium containing megaspores.

Origin:
1885–90; mega- + sporangium

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Collins
World English Dictionary
megasporangium (ˌmɛɡəspɔːˈrændʒɪəm)
 
n , pl -gia
Compare microsporangium the structure in certain spore-bearing plants in which the megaspores are formed: corresponds to the ovule in seed plants

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
megasporangium   (měg'ə-spə-rān'jē-əm)  Pronunciation Key 
Plural megasporangia
A plant structure in which megaspores are formed, such as those of the female cones of pines.
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