lanthanum

[ lan-thuh-nuhm ]

/ ˈlæn θə nəm /

noun Chemistry.

a rare-earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite. Symbol: La; atomic weight: 138.91; atomic number: 57; specific gravity: 6.15 at 20°C.

Origin of lanthanum

<New Latin (1841), equivalent to lanthan- (<Greek lanthánein to escape notice; referring to its position on the periodic table) + -um, variant of -ium-ium

Words nearby lanthanum

lantern ring, lantern slide, lantern wheel, lanthanide, lanthanide series, lanthanum, lanthorn, Lantsang, lanuginose, lanuginous, lanugo

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for lanthanum

Not to mention rare elements such as lanthanum, cerium, and neodymium, essential to modern technology and commanding high prices.
Afghanistan’s Mineral Wealth Could Be a Bonanza—or Lead to Disaster|Dr. Cheryl Benard|July 4, 2012|DAILY BEAST
Lanthanum, lan′tha-num, n. a metal discovered in 1839 in cerite, a hydrated silicate of cerium.
Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)|Various
Didymium, a rare metallic element, occurring along with lanthanum in the mineral cerite as discovered by Mosander in 1842.
The New Gresham Encyclopedia|Various
During an absence of several days, the inventor left a mantle of lanthanum oxide locked up in his laboratory.
Inventors at Work|George Iles

Lanthanum sulphide, La2S3, is a yellow powder, obtained when the oxide is heated in the vapour of carbon bisulphide.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 2|Various

British Dictionary definitions for lanthanum

lanthanum

/ (ˈlænθənəm) /

noun

a silvery-white ductile metallic element of the lanthanide series, occurring principally in bastnaesite and monazite: used in pyrophoric alloys, electronic devices, and in glass manufacture. Symbol: La; atomic no: 57; atomic wt: 138.9055; valency: 3; relative density: 6.145; melting pt: 918°C; boiling pt: 3464°C

Word Origin for lanthanum

C19: New Latin, from Greek lanthanein to lie unseen

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for lanthanum

lanthanum

[ lăn′thə-nəm ]

n. Symbol La

A soft malleable metallic rare-earth element used in glass manufacture. Atomic number 57.

Scientific definitions for lanthanum

lanthanum

[ lăn′thə-nəm ]

La

A soft, malleable, silvery-white metallic element of the lanthanide series. It is used to make glass for lenses and lights for movie and television studios. Atomic number 57; atomic weight 138.91; melting point 920°C; boiling point 3,469°C; specific gravity 5.98 to 6.186; valence 3. See Periodic Table.

单词	lanthanum
释义	lanthanum [ lan-thuh-nuhm ] / ˈlæn θə nəm / noun Chemistry. a rare-earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite. Symbol: La; atomic weight: 138.91; atomic number: 57; specific gravity: 6.15 at 20°C. Origin of lanthanum <New Latin (1841), equivalent to lanthan- (<Greek lanthánein to escape notice; referring to its position on the periodic table) + -um, variant of -ium-ium Words nearby lanthanum lantern ring, lantern slide, lantern wheel, lanthanide, lanthanide series, lanthanum, lanthorn, Lantsang, lanuginose, lanuginous, lanugo Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for lanthanum Not to mention rare elements such as lanthanum, cerium, and neodymium, essential to modern technology and commanding high prices. Afghanistan’s Mineral Wealth Could Be a Bonanza—or Lead to Disaster\|Dr. Cheryl Benard\|July 4, 2012\|DAILY BEAST Lanthanum, lan′tha-num, n. a metal discovered in 1839 in cerite, a hydrated silicate of cerium. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)\|Various Didymium, a rare metallic element, occurring along with lanthanum in the mineral cerite as discovered by Mosander in 1842. The New Gresham Encyclopedia\|Various During an absence of several days, the inventor left a mantle of lanthanum oxide locked up in his laboratory. Inventors at Work\|George Iles Lanthanum sulphide, La2S3, is a yellow powder, obtained when the oxide is heated in the vapour of carbon bisulphide. Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 2\|Various British Dictionary definitions for lanthanum lanthanum / (ˈlænθənəm) / noun a silvery-white ductile metallic element of the lanthanide series, occurring principally in bastnaesite and monazite: used in pyrophoric alloys, electronic devices, and in glass manufacture. Symbol: La; atomic no: 57; atomic wt: 138.9055; valency: 3; relative density: 6.145; melting pt: 918°C; boiling pt: 3464°C Word Origin for lanthanum C19: New Latin, from Greek lanthanein to lie unseen Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for lanthanum lanthanum [ lăn′thə-nəm ] n. Symbol La A soft malleable metallic rare-earth element used in glass manufacture. Atomic number 57. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for lanthanum lanthanum [ lăn′thə-nəm ] La A soft, malleable, silvery-white metallic element of the lanthanide series. It is used to make glass for lenses and lights for movie and television studios. Atomic number 57; atomic weight 138.91; melting point 920°C; boiling point 3,469°C; specific gravity 5.98 to 6.186; valence 3. See Periodic Table. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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