sĭlĭcĕus — Lewis & Short
sĭlĭcĕus, a, um, adj.silex,
I of flint or limestone, silicious:
saxa,Vitr. 8, 3 fin.:
lapides,Cato, R. R. 18, 3.—Trop.: cor, Laev. ap. Gell. 19, 7, 10.