hot liquid rock that comes out of a volcano （火山喷出的）熔岩，岩浆 molten lava 熔化的火山岩浆
this type of rock when it has cooled and become hard 火山岩
Word Originmid 18th cent.: from Italian (Neapolitan dialect), denoting the lava stream from Vesuvius (an active volcano near Naples in Italy), but originally denoting a stream caused by sudden rain, from lavare ‘to wash’, from Latin.