noun
macrosporangium; megasporangium
Botanical term for the structure that produces megaspores in plants.
大胞子嚢は種子植物の胚珠の内部に見られる。
The megasporangium is found inside the ovule of seed plants.
Compound of 大 (large) + 胞子 (spore) + 嚢 (sac, capsule). The exact historical derivation is uncertain; the spelling is conventionally associated with the botanical meaning.