Rubric :: Rubric (n.) The title of a statute; -- so called as being anciently written in red letters.
Rubric :: Rubric (n.) 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..
Rubric :: Rubric (n.) Hence, that which is established or settled, as by authority; a thing definitely settled or fixed..
Rubric :: Rubric (v. t.) To adorn ith red; to redden; to rubricate.