"Rubric" is a word in LAW AND LEGAL, ENGLISH

Directions printed in books of law and ln prayer-books, so termed because they were originally distinguished by red lnk

A titlepage, or part of it, especially that giving the date
and place of printing; also, the initial letters, etc., when printed in
red.

The title of a statute; -- so called as being anciently
written in red letters.

Hence, that which is established or settled, as by
authority; a thing definitely settled or fixed.

Alt. of Rubrical

That part of any work in the early manuscripts and
typography which was colored red, to distinguish it from other
portions.

The directions and rules for the conduct of service,
formerly written or printed in red; hence, also, an ecclesiastical or
episcopal injunction; -- usually in the plural.

To adorn ith red; to redden; to rubricate.