lanthanum


lanthanum
A metallic element, atomic no. 57, atomic wt. 138.9055; first of the rare earth elements (lanthanides). [G. lanthano, to lie hidden]
- l. nitrate La(NO3)3; used in electron microscopy as a stain for extracellular mucopolysaccharides.

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lan·tha·num -nəm n a white soft malleable metallic element that occurs in rare-earth minerals symbol La see ELEMENT (table)

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lan·tha·num (La) (lanґthə-nəm) [Gr. lanthanein to be concealed] a rare metallic element, atomic number 57, atomic weight 138.91.

Medical dictionary. 2011.