A specialized pouch or chamber in certain parasitic organisms (especially some flatworms) where offspring develop before being released.
From brood (offspring) + sac (pouch). The term was created by parasitologists in the 1800s to describe the reproductive structures of parasites.
A broodsac is nature's grotesque diaper—parasitic flatworms literally carry developing babies in a sac until they're ready to infect new hosts. Evolution found a way to turn parasitism into a pregnancy system!
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