IPA: //ˈsaɪlɛks//
KK: /ˈsaɪlɛks/
A type of finely ground silica or siliceous material, often used as a filler in paints or wood products.
The painter chose to use silex as a filler to improve the texture of the paint.
The word 'silex' comes from Latin 'silex' (meaning flint or hard stone). It refers specifically to a type of hard, siliceous rock used historically for making tools and starting fires.
Think of 'silex' as a hard stone used for making tools — this helps you remember that it refers to flint or a similar material.