Lanthanum

[lænθәnәm]

解释:

(noun.) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.

德斯蒙德录入--From WordNet

解释:

(n.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La.

巴顿整理

解释:

n. a metal discovered in 1839 in cerite a hydrated silicate of cerium.—Also Lan′thānium.

奥罗拉编辑