| rectal | (adjective) of or involving the rectum | - |
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| rectangular | (adjective) having four right angles | - |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: orthogonal |
| rectifiable | (adjective) capable of being repaired or rectified | Synonyms: reparable |
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| rectified | (adjective) having been put right | - |
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| rectilineal | (adjective) characterized by a straight line or lines | Synonyms: rectilinear |
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| rectilinear | (adjective) characterized by a straight line or lines | Synonyms: rectilineal |
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| rectosigmoid | (adjective) of or related to or near the sigmoid colon and the upper part of the rectum | - |
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