blub

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blub

A small hole in a mold or plaster cast, formed by trapped air.
References in periodicals archive ?
The children have learned about how to look after the seeds and blubs, also encouraging parents and carers to be involved too.
Lee's Recent Comments on LED Markets LED blub shipment Around 150 million units worldwide in 2011 and approximately three times more in 2012.
But then the student fee U-turner says he only blubs at music.