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Definition of: nematocyst
(nem′ə·tō·sist′) noun Zool.
One of the stinging cells in jellyfishes, polyps, and other hydrozoans, in the interior of which is coiled a long filament whose instantaneous release causes paralysis of the organism it touches: also called lasso cell, nettle cell.
—nem′a·to·cys′tic adjective
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