reus

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
REUS, civil law. This word has two different meanings. 1. A party to a suit, 
whether plaintiff or defendant; Reus est qui cum altero litem contestatem 
habet, sive legit, sive cum eo adum est. 2. A party to a contract; reus 
credendi is be to whom something is due, by whatever title it may be; reus 
debendi is he who owes, for whatever cause. Poth. Pand. lib. 50, h.t. 
    

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