- rectangleAny quadrilateral having opposing sides parallel and four right angles.
- rectifyTo heal (an organ or part of the body).
- rectusAny of a number of muscles controlling the movement of the eyeball.
- rectitudeStraightness; the state or quality of having a constant direction and not being crooked or bent.
- recti-straight
- rectus abdominisA paired muscle running vertically on each side of the anterior wall of the abdomen in humans and some other mammals.