单词	nematocyst
释义	nematocyst /nɪˈmatə(ʊ)sɪst / /ˈnɛmətə(ʊ)sɪst/ noun Zoology A specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defence or to capture prey.Casually touching many cnidarians will make it clear how they got their name when their nematocysts eject barbed threads tipped with poison.... If collar cells and spicules are defining characteristics of the Phylum Porifera, then nematocysts define cnidarians. As a feeding adaptation, the anemones are equipped with stinging cells called nematocysts, which are triggered as soon as a tentacle touches a living organism, paralyzing it upon contact.
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