胚はい嚢のうはいのうMeanings1nounembryo sacbotanyBotanical term for the female gametophyte of seed plants, containing the egg cell.被ひ子し植しょく物ぶつでは、胚はい嚢のうの中なかで卵らん細さい胞ぼうが形けい成せいされる。In angiosperms, the egg cell is formed within the embryo sac.