From ZooTerms (Dictionary of Invertebrate Zoology)
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nematocyst also cnida (noun; Greek nema, thread; kystis, bladder): (Cnidaria) Intracellular organelles that function in defense and capture of prey by injecting a toxin; in hydras, they function in adhesion to the bottom; also called stinging cells, nettle cells, or thread capsule or cell

See also: spirocyst