air bell

noun

Definition of air bell 

1 : a hollow inverted vessel (such as a diving bell or bell jar) An air bell was used in the construction of one of the new piers for the Baltimore & Ohio R. R. bridge over the Allegheny River at Pittsburgh, Pa.Engineering and Contracting, July–December 1922

2 : an air bubble

3 : an undeveloped spot on a negative or print caused by the adherence of an air bubble to the film surface during development

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First Known Use of air bell

1782, in the meaning defined at sense 1

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The first known use of air bell was in 1782

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