Webster's English Dictionary

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beryl

ber.yl \'ber-*l\ n [ME, fr. OF beril, fr. L beryllus, fr. Gk be-ryllos, of 
   In]dic origin; akin to Skt vaidu-rya cat's-eye : a mineral Be3Al2Si6O18 
   consisting of a silicate  of beryllium and aluminum of great hardness and 
   occurring in green, bluish green, yellow, pink, or white hexagonal prisms