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									[ noun ] a seal that must be broken when first used and cannot easily be resealed  Examples "it was stored in a tube with a break seal" Used in print(Francis J. Johnston and John E. Willard, "The...) The purified product was stored at_- 78 ` in a tube equipped with a break_seal . The radiochlorine was stored at_- 78 ` in a tube equipped with a break_seal . Purified inactive chlorine was then added from one of the tubes described above and the mixture frozen_out and sealed_off in a flask equipped with a break_seal . Related terms | 
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