novaculite noun. [nǝ(ʊ)'vakjʊlʌɪt] L18.
[from Latin novacula razor + -ITE¹.]
Orig., any of various smooth hard rocks used to make whetstones. Now spec. in Petrography, a dense hard fine-grained siliceous rock resembling chert with a high content of quartz microcrystals.

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