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countable and uncountable, plural silexes or silices
(archaic) Flint.
A finely ground relatively pure form of silicas used as a paint filler etc. quotations examples
Every little cold gust that I observed in the Colorado country had this corkscrew character […] an auger, of diameter varying from an inch to a thousand feet, capable of altering its direction so as to bore curved holes, revolving with incalculable rapidity, and armed with a cutting edge of silex.
1864, Fitz-Hugh Ludlow, The Atlantic