Definition of beryl
: a mineral consisting of a silicate of beryllium and aluminum of great hardness that occurs in colorless hexagonal prisms when pure and in various colors (such as green, blue, yellow, or pink) when not pure, that is valued as a source of gems, and that is the principal source of beryllium
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Merriam-Webster unabridged
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Time Traveler for beryl
The first known use of beryl was in the 13th century
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