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cnida

[nahy-duh]
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noun, plural cni·dae [nahy-dee] /ˈnaɪ di/. Zoology.
  1. a nematocyst.
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Origin of cnida

1875–80; < Latin cnīdē nettle < Greek knī́dē
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018