tantalum(redirected from Tantalium)
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n. Symbol Ta
A very hard, dense, gray metallic element that occurs chiefly in columbite-tantalite and is exceptionally resistant to chemical attack below 150°C. It is used to make electrolytic capacitors for portable electronic and computing devices; superalloys for aircraft, missile, and nuclear reactor parts; filaments; and surgical instruments. Atomic number 73; atomic weight 180.948; melting point 3,017°C; boiling point 5,458°C; specific gravity 16.4; valence 2, 3, 4, 5. See Periodic Table.
[New Latin, from Latin Tantalus, Tantalus (from its high resistance to absorbing acids even when immersed in them); see Tantalus.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) a hard greyish-white metallic element that occurs with niobium in tantalite and columbite: used in electrical capacitors in most circuit boards and in alloys to increase hardness and chemical resistance, esp in surgical instruments. Symbol: Ta; atomic no: 73; atomic wt: 180.9479; valency: 2, 3, 4, or 5; relative density: 16.654; melting pt: 3020°C; boiling pt: 5458±100°C
[C19: named after Tantalus, with reference to the metal's incapacity to absorb acids]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
tan•ta•lum(ˈtæn tl əm)
a hard, gray, rare metallic element that resists corrosion by most acids: used for chemical, dental, and surgical instruments. Symbol: Ta; at. wt.: 180.948; at. no.: 73; sp. gr.: 16.6.
[< Swedish (1802); after Tantalus, alluding to the nonabsorption of acids]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Symbol Ta A hard, heavy, gray metallic element that is highly resistant to corrosion at lower temperatures. It is used to make light-bulb filaments, surgical instruments, and glass for camera lenses. Atomic number 73. See Periodic Table.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||tantalum - a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals
tantalite - a mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite; an ore of tantalum
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English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.