silex /sīˈleks/

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

• quadrigae
• quadrigeminal
• quadrigeminate
• quadrigeminous
• quadrilateral
• quadrilateral prism
• quadrilaterals
• quadrilingual
• quadriliteral
• quadriliterals
• quadrille
• quadrilled
• quadriller
• quadrillers
• quadrilles
• quadrilling
• quadrillion
• quadrillions
• quadrillionth
• quadrillionths
• quadrilocular
• quadringenaries
• quadringenary
• quadrinomial
• quadrinomials