rock froth
noun
Molten or solidified lava that has expanded or that is low in density due to the presence of internal bubbles of steam or gas.
Origin
Late 19th century.
- plastic merit
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- plastic sulfur
- plastic sulphur
- plastic surgeon
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- plasticware
- plastic wood
- plastic wrap
- plastic-wrapped
- plastid
- plastidome
- plastidule
- plastifier
- plastify
- plastigel
- plastimeter
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- plastination
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- plastiquer
- plastiqueur
- plastisol
- plastochron