Etymology
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sporangium (n.)

"a case containing spores," 1821, Modern Latin (plural sporangia), from Greek spora "spore" (see spore) + angeion "vessel" (see angio-).

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Definitions of sporangium

sporangium (n.)
organ containing or producing spores;
Synonyms: spore case / spore sac
From wordnet.princeton.edu