1. {n} An uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds.
2. {n} a marble made from this stone
3. {v} [obsolete] On the way; agoing;
photo: by Marian Szengel, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
marbles (I had a more magnificent collection of agates than I have ever seen any boy possess— and the nucleus of the collection was a handful worth at least three dollars, which I had kept as security for twenty cents I loaned to a messenger-boy who was sent to reform school before he could redeem them).
Jack London. John Barleycorn
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My meat shall all come in, in Indian shells,
Dishes of agat set in gold, and studded
With emeralds, sapphires, hyacinths, and rubies.
Ben Jonson. The Alchemist (1610)
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Only on a small table in the corner was there a litter of odds and ends—lacquered snuffoxes, agate brooches and the like—which looked as though they might include something interesting.
George Orwell. 1984 (1949)
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His black, agate pupils with saffron-yellow whites moved restlessly near the lower eyelids.
Leo Tolstoy. War and Peace: With bonus material from Give War and Peace A Chance by Andrew D. Kaufman
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She knew the qualities of each gem, [...] Agate encourages you to be attentive to your surroundings, and it would have been a good fit for my situation,
Melania G. Mazzucco. Limbo (Virginia Jewiss translation), p.346 (2014)
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First we turn by the vagurin here and then it’s gooder. So side by side, turn agate, weddingtown, laud men of Londub!