Definition of agate
1
: a fine-grained variegated chalcedony having its colors arranged in stripes, blended in clouds, or showing mosslike forms
2
: something made of or fitted with agate: such as
a
: a drawplate used by gold-wire drawers
b
: a playing marble of agate
3a
: a size of type approximately 5¹/₂ point
b
: condensed information (such as advertisements or box scores) set especially in agate type
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Merriam-Webster unabridged
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Time Traveler for agate
The first known use of agate was in the 15th century
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