Crossword Genius

Mafic or ultramafic flow from a volcano, say (4)

Ross

I believe the answer is:

lava

(Other definitions for lava that I've seen before include "Volcanic stream" , "Stuff heatedly hurled out" , "Unstoppable red tide" , "Hot molten rock" , "Outflow from volcano" .)

I've seen this clue in The Washington Post.
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