Origin: ModL: so named (1839) by G. Mosander (see erbium) < lanthana, lanthanum oxide, lit., the hidden one < Gr lanthanein, to be hidden (see latent): it had previously been undetected in the mineral cerite
See lanthanum in American Heritage Dictionary 4
noun Symbol La
Origin: New Latin
Origin: , from Greek lanthanein, to escape notice (from the finding of the element hidden in oxide of cerium).
Learn more about lanthanum