A sac or pouch-like structure in certain sea slugs that stores stolen stinging cells from jellyfish they consume, using them for their own defense.
From Greek knide (sting) + Latin saccus (sack, pouch). Names the specialized storage organ that allows some sea slugs to weaponize stolen cnidocytes.
Sea slugs literally eat jellyfish and then steal their stinging cells to use against their own predators—nature's ultimate recycling program!
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