spirit-level

spirit level

noun Surveying.
a device for determining true horizontal or vertical directions by the centering of a bubble in a slightly curved glass tube or tubes filled with alcohol or ether.
Also called level.


Origin:
1760–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spirit level
 
n
a device for setting horizontal surfaces, consisting of an accurate block of material in which a sealed slightly curved tube partially filled with liquid is set so that the air bubble rests between two marks on the tube when the block is horizontal

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