bilinguis

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
BILINGUIS, English law. One who uses two tongues or languages. Formerly a 
jury, part Englishmen and part foreigners, to give a verdict between an 
Englishman and a foreigner. Vide Medietas Linguae, Plowd. 2. It is abolished 
in Pennsylvania. Act April 14, 1834, Sec. 149. 
    

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