Yttrium-metal
any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.
noun
(chem) any one of a group of elements including yttrium and the related lanthanides, holmium, erbium, thulium, ytterbium, and lutetium
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a white, water-insoluble powder, y 2 o 3 , used chiefly in incandescent gas and acetylene mantles. noun a colourless or white insoluble solid used mainly in incandescent mantles. formula: y2o3 also called yttria noun another name for yttrium oxide
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a mineral, tantalite and niobate of yttrium and various elements, as iron, and cerium, occurring in the form of brown-black crystals. historical examples a dictionary of arts, manufactures and mines andrew ure
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(in philosophical taoism) action of an artificial or arbitrary kind.
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a river in se asia, flowing se from sw china through indochina to the gulf of tonkin. 500 miles (800 km) long.