Webster's 1828 Dictionary
SILEX, SILCIA
n.One of the supposed primitive earths m usually found in the state of stone. When pure, it is perfectly white or colorless. The purer sorts are mountain crystal and quartz. Recent experiments prove this to be a compound substance, the base of which is a metal called silicium. Silica then is an oxyd of silicium.
Webster's 1913 Dictionary
SILEX
Si "lex, n. Etym: [L., a finit, a pebblestone. ] (Min. )
Defn: Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic.
New American Oxford Dictionary
silex
si lex |ˈsīleks ˈsaɪlɛks | ▶noun silica, esp. quartz or flint. ORIGIN late 16th cent.: from Latin, ‘flint. ’
Oxford Dictionary
silex
silex |ˈsʌɪlɛks | ▶noun [ mass noun ] silica, especially quartz or flint. ORIGIN late 16th cent.: from Latin, ‘flint ’.
French Dictionary
silex
silex n. m. nom masculin Pierre dure composée de silice.
Spanish Dictionary
sílex
sílex nombre masculino Piedra muy dura formada principalmente por sílice y que al romperse forma unos bordes muy cortantes :el sílex es una variedad del cuarzo; los hombres de las cavernas usaban sílex para cortar la carne y las pieles de los animales .SINÓNIMO pedernal .El plural es sílex .
The Wordsmith Dictionary