lanthanum metallic rare earth element, 1841, coined in Modern Latin by Swedish chemist and mineralogist Carl Gustav Mosander (1797-1858), who discovered it in 1839, from Gk. lanthanein "to lie hidden, escape notice," from PIE root *ladh- "to be hidden" (see LATENT (Cf. latent)). So called because the element was "concealed" in rare minerals.

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  • Lanthanum — (pronEng|ˈlænθənəm) is a chemical element with the symbol La and atomic number 57. Characteristics Lanthanum is a silvery white metallic element that belongs to group 3 of the periodic table and is a lanthanoid. Found in some rare earth minerals …   Wikipedia

  • lanthanum — Symbol: La Atomic number: 57 Atomic weight: 138.9055 (From the Greek word lanthanein, to line hidden) Silvery metallic element belonging to group 3 of the periodic table and oft considered to be one of the lanthanoids. Found in some rare earth… …   Elements of periodic system

  • lanthanum — [lan′thənəm] n. [ModL: so named (1839) by G. Mosander (see ERBIUM) < lanthana, lanthanum oxide, lit., the hidden one < Gr lanthanein, to be hidden (see LATENT): it had previously been undetected in the mineral cerite] a soft, malleable,… …   English World dictionary

  • Lanthanum — Lan tha*num (l[a^]n th[.a]*n[u^]m), n. [NL., fr. Gr. lanqa nein to lie hid, to be concealed.] (Chem.) A rare element of the rare earth group of the metals, of atomic number 57, allied to aluminum. It occurs in certain rare minerals, as cerite,… …   The Collaborative International Dictionary of English

  • lanthanum — salts are used as a negative stain in electron microscopy, and as calcium channel blockers …   Dictionary of molecular biology

  • lanthanum — /lan theuh neuhm/, n. Chem. a rare earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite. Symbol: La; at. wt.: 138.91; at. no.: 57; sp. gr.: 6.15 at 20°C. [ < NL (1841), equiv. to lanthan ( < Gk lanthánein …   Universalium

  • lanthanum — lantanas statusas T sritis chemija apibrėžtis Cheminis elementas. simbolis( iai) La atitikmenys: lot. lanthanum angl. lanthanum rus. лантан …   Chemijos terminų aiškinamasis žodynas

  • lanthanum — noun [lɑ˧nˈðaː˨nɔ˧m] a) A metallic chemical element (symbol La) with an atomic number of 57. b) lanthanum See Also: lanthana, lanthanate, lanthanide, lanthanite, lanthanoid, lanthanon …   Wiktionary

  • lanthanum — lantanas statusas T sritis fizika atitikmenys: angl. lanthanum vok. Lanthan, n rus. лантан, m pranc. lanthane, m …   Fizikos terminų žodynas

  • Lanthanum strontium cobalt ferrite — (LSCF), also called lanthanum strontium cobaltite ferrite is a ceramic material of the ferrite group. It is a mixture of lanthanum(III) oxide, strontium oxide, cobalt oxide and iron oxide (cobalt iron oxide).It is black in color and crystallizes… …   Wikipedia

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