bung

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bung

(bŭng) [ME. bunge, stopper]
A stopper or diaphragm that covers a vial and prevents fluids from escaping.
References in periodicals archive ?
Students across Wales are being armed with rubber bungs so they don't fall prey to drink spikers.
Welsh students are being given rubber bungs to help stop them becoming a victim to drink spikers.
The liquid disinfectant solution had been used to sterilise the rubber bungs at the top of the small bottles.