MAINPRISE n. 2 definitions
A writ directed to the sheriff, commanding him to take sureties, called mainpernors, for the prisoner's appearance, and to let him go at large. This writ is now obsolete. Wharton.
NATURAL a.
f matter and mind, as known by man; within the scope of human reason or experience; not supernatural; as, a natural law; natural science; history, theology. I call that natural religion which men might know ... by the mere principles of reason, improved by consideration and experience, without the help of revelation. B…