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Rectilinearity
- The quality or state of being rectilinear.
Rectinerved
- Having the veins or nerves straight; -- said of leaves.
Rectiserial
- Arranged in exactly vertical ranks, as the leaves on stems of many kinds; -- opposed to curviserial.
Recto-
- A combining form indicating connection with, or relation to, the rectum; as, recto-vesical.
Rectoral
- Pertaining to a rector or governor.