chalcedonous
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chalcedonous — chal·ced·o·nous … English syllables
chalcedony — chalcedonic /kal si don ik/, chalcedonous, adj. /kal sed n ee, kal seuh doh nee/, n., pl. chalcedonies. a microcrystalline, translucent variety of quartz, often milky or grayish. [1275 1325; ME calcedonie < LL chalcedonius (Vulgate, Rev. XIX, 19) … Universalium
chalcedony — n. blue or grey variety of quartz. ♦ chalcedonic, ♦ chalcedonous, a … Dictionary of difficult words