silex /sīˈleks/

1. Silica or quartz
2. A heat-resistant and shock-resistant glass formed of fused quartz

• horse-faced
• horse fair
• horse fairs
• horsefeathers
• horseflesh
• horsefleshes
• horseflesh ore
• horseflies
• horsefly
• horse-foot
• horse-godmother
• horse-godmothers
• horse-gowan
• horse-gowans
• horse guards
• horsehair
• horsehairs
• horsehair worm
• horsehide
• horsehides
• horse hoe
• horse hoes
• horse-knacker
• horse-knackers
• horse latitudes