lava lamp

noun
plural lava lamps

Definition of lava lamp 

: a decorative lamp constructed of a transparent glass container filled with liquid and wax that is heated by an incandescent bulb which melts the wax and causes it to form random moving shapes within the liquid Lava lamps are back—and not just among retro hipsters lounging on shag rugs and waterbeds.— Richard A. Kerr The lava lamp on my son's bureau gives him a vantage point to ponder the colorful blobs rising and falling as their temperature and density change.— Benjamin A. Brooks

First Known Use of lava lamp

1965, in the meaning defined above

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The first known use of lava lamp was in 1965

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