lanthanum
n. (வேதி.) 1க்ஷ்3ஹீ-41 ஆம் ஆண்டுக்காலத்தில் கண்டுபிடிக்கப்பட்ட அலுமினிய உலோகக் குழுவினர் சார்ந்த அரிய தனிமப்பொருள்.
Lan"tha*num, n. Etym: [NL., fr. Gr. (Chem.) Defn: 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. [Formerly written also lanthanium.]