ETYM Old Eng. rubriche, Old Fren. rubriche, French rubrique (cf. it. rubrica), from Latin rubrica red earth for coloring, red chalk, the title of a law (because written in red), from ruber red. Related to red.
1. A heading that is printed in red or in a special type.
2. An authoritative rule.
Passage in book printed in red or other distinctive type, especially such direction in service book; any direction as to conduct or ceremony; title; heading.
To adorn with ruby red color.