| metasequoia | (noun) large fast-growing Chinese monoecious tree having flat bright-green deciduous leaves and small globular cones; commonly cultivated in United States as an ornamental; known as a fossil before being discovered in China | Synonyms: dawn redwood, Metasequoia glyptostrodoides |
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| quoin | (noun) (architecture) solid exterior angle of a building; especially one formed by a cornerstone | Synonyms: corner |
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| (noun) the keystone of an arch | Synonyms: coign, coigne |
| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coign, coigne |
| quoit | (noun) game equipment consisting of a ring of iron or circle of rope used in playing the game of quoits | - |
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| quoits | (noun) a game in which iron rings (or open iron rings) are thrown at a stake in the ground in the hope of encircling it | Synonyms: horseshoes |
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| sequoia | (noun) either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: redwood |
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| (noun) wood of either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: redwood |
| turquoise | (noun) a shade of blue tinged with green | Synonyms: aqua, aquamarine, cobalt blue, greenish blue, peacock blue |
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| (noun) a blue to grey green mineral consisting of copper aluminum phosphate | - |