Definition of silex in English:

silex

noun

  • [mass noun] Silica, especially quartz or flint.

    • ‘Not even from the Northern Germany megalithic culture, a drilled axe has been reported that was made of Silex (flint) and thus of a material of comparable hardness.’
    • ‘Of diverse types and materials (weapons and tools made of silex or metal, ceramics, decorative items made of stone or metal), these objects illustrate the evolution of human civilizations from the Neolithic Age (5000 years B.C.) to the Iron Age (800 years B.C.).’

Origin

Late 16th century: from Latin, flint.

Pronunciation:

silex

/ˈsʌɪlɛks/