Crossword Genius

Marshmallow, to scientists (4)

Ross

I believe the answer is:

foam

(Other definitions for foam that I've seen before include "Froth or spume" , "Boiling bubbles" , "Froth created by wave or soap" , "At the mouth, this may mean madness or extreme anger" , "Suspension of gas in a liquid" .)

I've seen this clue in the Newsday.
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