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Rubiform
- Having the nature or quality of red; as, the rubiform rays of the sun.
Rubiginous
- Having the appearance or color of iron rust; rusty-looking.
Rubiretin
- One of the red dye products extracted from madder root, and probably identical with ruberythrinic acid.
Rubrical
- Colored in, or marked with, red; placed in rubrics.
Rubricist
- One skilled in, or tenaciously adhering to, the rubric or rubrics.
Rubstone
- A stone for scouring or rubbing; a whetstone; a rub.