| rectangle | (noun) a parallelogram with four right angles | - |
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| rectangularity | (noun) the property of being shaped like a rectangle | Synonyms: oblongness |
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| rectification | (noun) the act of offering an improvement to replace a mistake; setting right | Synonyms: correction |
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| (noun) determination of the length of a curve; finding a straight line equal in length to a given curve | - |
| (noun) the conversion of alternating current to direct current | - |
| (noun) (chemistry) the process of refinement or purification of a substance by distillation | - |
| rectifier | (noun) electrical device that transforms alternating into direct current | - |
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| (noun) a person who corrects or sets right | - |
| rectilinearity | (noun) the property possessed by a line or surface that is rectilinear, straight. | - |
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| rectitude | (noun) righteousness as a consequence of being honorable and honest | Synonyms: uprightness |
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| recto | (noun) right-hand page | - |
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| rectocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: proctocele |
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| rectoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: proctoplasty |
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| rector | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, pastor |
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| rectorate | (noun) the office or station of a rector | Synonyms: rectorship |
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| rectorship | (noun) the office or station of a rector | Synonyms: rectorate |
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| rectory | (noun) an official residence provided by a church for its parson or vicar or rector | Synonyms: parsonage, vicarage |
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| rectum | (noun) the terminal section of the alimentary canal; from the sigmoid flexure to the anus | - |
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| rectus | (noun) any of various straight muscles | - |
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