Definition of mainpernor in US English:

mainpernor

(also mainpernour)

noun

Law
historical
  • A person who stands surety that another (especially a prisoner) will fulfil a legal obligation to appear in court on a specified day.

Origin

Middle English; earliest use found in Statutes of the Realm. From Anglo-Norman mainpernour, meinparnour, mainprenur from mainprendre to act as guarantee, probably after post-classical Latin manucapere.

Pronunciation

mainpernor

/ˈmeɪnpəːnə/