lithium

Lithium comes from New Latin lithium, built on Ancient Greek λίθος (líthos), meaning "stone," plus the chemical suffix -ium.

The word was coined in New Latin as a scientific name, taking the Greek word for stone and adapting it with the standard element-naming suffix -ium.

The Greek root líthos also shows up in English words for stone-related science, though no specific cognate is given here.