The term 'Terminer's Partner' refers to an Oyer, which is a legal term for a court officer who hears and determines cases. This position is often held by a judge or magistrate, and they are responsible for deciding the outcome of a case. The Oyer is usually partnered with a Terminer, who is a court officer responsible for determining the facts of a case. Together, the Oyer and Terminer form a judicial team that is responsible for making decisions in court.