Lantanum n. : See Lanthanum.

Example:
what is Lantanum oxide, and what is it for?

Taxonomy
lanthanum, rare earths, oxide, 06-06, element, Lanthanum oxide, Lanthanum fluoride, glass, isotopes of lanthanum, stable, compounds, Monazite, Lanthanum carbonate, purification, ammonium nitrate, CRC Press, lanthanum chloride, nitrates.

Defination from the web:
... Lanthanum is malleable, ductile, and soft metal, which oxidizes rapidly when exposed to air. ... Main article: isotopes of lanthanum ...