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This hapax is questionable, and two alternative readings present themselves. Firstly, the word may be the result of a superfluous or misinterpreted er abbreviation symbol, and needs to be corrected to prison(er)ez, i.e. the past participle of the verb
prisoner1. Secondly, the word may be a noun rather than an adjective, and thus the plural of the noun
prisoner2 (with a voiced -ez suffix instead of -es).