lava lamp

World English Dictionary
lava lamp
a decorative type of lamp in which a luminous viscous material moves in constantly changing shapes
[C20: from the resemblance of the shapes to molten lava in water]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Cite This Source's 21st Century Lexicon
Main Entry:  lava lamp
Part of Speech:  n
Definition:  a glass lamp lit from the bottom and containing a soft gel that moves and grows as the light heats it; also called lava light
Etymology:  from the gel's similarity to volcano lava; created in 1963 by Edward Craven Walker
Usage:  trademark's 21st Century Lexicon
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