silex/ˈsaɪˌlɛks/EtymologyBrand name.nounFlint.A finely ground relatively pure form of silicas used as a paint filler etc.“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.”A vacuum coffee maker.“The Navy uses several types of coffee makers – urns, silexes, and percolators. Each type requires special care in making good coffee.”