si·lex 
(sīlĕks′)
(sīlĕks′)n.
1. Silica.
2. Finely ground tripoli used as an inert paint filler.
[Latin, hard stone, flint.]
- freeway
- free weight
- freewheel
- freewheeling
- free will
- freewill
- free world
- freewrite
- freewriting
- freezable
- freeze
- freeze blood
- freeze-dry
- freeze-etch
- freeze-etching
- freeze-frame
- freeze frame
- freeze out
- freezer
- freezer burn
- freeze (someone's) blood
- freeze someone's blood
- freezing point
- free zone
- F region