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From The Collaborative International Dictionary of English v.0.48:
Unseal \Un*seal"\ ([u^]n*s[=e]l"), v. t. [1st pref. un- + seal.] 1. To break or remove the seal of; to open, as what is sealed; as, to unseal a letter. [1913 Webster] Unable to unseal his lips beyond the width of a quarter of an inch. --Sir W. Scott. [1913 Webster] 2. To disclose, as a secret. [Obs.] --The Coronation. [1913 Webster]