ALL meanings of lanthanum
lan·tha·num
L l - noun lanthanum chemical element 1
- noun lanthanum The chemical element of atomic number 57, a silvery-white rare earth metal. 1
- noun lanthanum 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. 1
- noun lanthanum 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 0
- noun lanthanum a soft, malleable, silvery chemical element, one of the rare-earth elements and the first member of the lanthanide series: symbol, La; at. no., 57 0
- noun lanthanum (Uncountable Noun) A metallic chemical element (symbol La) with an atomic number of 57. 0
- noun lanthanum (Countable Noun) An atom of this element. 0