- silica, esp. in the form of flint or quartz
- heat-resistant glass made of fused quartz
Origin of silexClassical Latin (gen. silicis), dissimilated from an unverified form scilec- from an unverified form scelic- from Indo-European base an unverified form (s)kel-, to cut from source shelf, shield
- Finely ground tripoli used as an inert paint filler.
Origin of silexLatin hard stone, flint
From Latin silex.