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adjective, Chemistry.
containing trivalent tantalum.
of or containing tantalum in the trivalent state


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  • Tantalum

    noun, Chemistry. 1. a gray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and apparatus. Symbol: Ta; atomic weight: 180.948; atomic number: 73; specific gravity: 16.6. noun 1. a hard greyish-white metallic element […]

  • Tantalus

    noun, plural Tantaluses for 2. 1. Classical Mythology. a Phrygian king who was condemned to remain in Tartarus, chin deep in water, with fruit-laden branches hanging above his head: whenever he tried to drink or eat, the water and fruit receded out of reach. 2. (lowercase) Chiefly British. a stand or rack containing visible decanters, […]

  • Tantalus-monkey

    [tan-tl-uh s] /ˈtæn tl əs/ noun 1. a long-tailed African monkey, Cercopithecus tantalus (or C. aethiops tantalus), of central African grasslands, having a long face framed by upswept whiskers.

  • Tantamount

    adjective 1. equivalent, as in value, force, effect, or signification: His angry speech was tantamount to a declaration of war. adjective 1. (postpositive) foll by to. as good (as); equivalent in effect (to): his statement was tantamount to an admission of guilt

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