| NAR | nasal airway resistance; National Association for Retarded [Children, Citizens]; no action required |
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| NAS | nasal; National Academy of Sciences; National Association of Sanitarians; neonatal airleak syndrome;... |
| N-CPAP, | n-CPAP nasal continuous positive airway pressure |
| ND | Doctor of Naturopathy; nasal deformity; natural death; Naval Dispensary; neonatal death; neoplastic ... |
| NSR | nasal septal reconstruction; nonspecific reaction; normal sinus rhythm; no sign of recurrence; not s... |
| trapezoid ridge | The area on the inferior surface of the clavicle near its lateral extremity on which the trapezoid ligament attaches. Synonym: linea trapezoidea, trapezoid ridge. (05 Mar 2000) |
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| triangular ridge | A crest or ridge which extends from the apex of a cusp of a premolar or molar tooth toward the central part of the occlusal surface. Synonym: triangular crest, triangular ridge. (05 Mar 2000) |
| epidermal ridge count | An index of the frequency of sweat pores on the fingertips by enumeration along a set of arbitrarily defined lines; a classic example of a galtonian trait determined almost exclusively by genetic factors. (05 Mar 2000) |
| epipericardial ridge | An elevation separating the developing pharyngeal region from the embryonic pericardium. (05 Mar 2000) |
| external oblique ridge | A horizontal bony crest on the external surface of the body of the mandible, inferior to the alveolar bone, marking the site of attachment of the buccinator muscle. (05 Mar 2000) |
| key ridge | A craniometric point located externally at the lowest extent of the zygomaticomaxillary suture. Synonym: key ridge, zygomaxillary point. (05 Mar 2000) |
| urogenital ridge | One of the paired longitudinal ridge's developing in the dorsal body wall of the embryo on either side of the dorsal mesentery; the ridge is formed at first by the growing mesonephros and later by the mesonephros and the gonad. Synonym: genital fold, wolffian ridge. (05 Mar 2000) |
| lateral epicondylar ridge | The distal sharp portion of the lateral margin of the humerus. Synonym: crista supracondylaris lateralis, lateral epicondylar crest, lateral epicondylar ridge, lateral supracondylar crest. (05 Mar 2000) |
| lateral supracondylar ridge | The distal sharp portion of the lateral margin of the humerus. Synonym: crista supracondylaris lateralis, lateral epicondylar crest, lateral epicondylar ridge, lateral supracondylar crest. (05 Mar 2000) |
| linguocervical ridge | A ridge occurring on the lingual surface, near the cervix, of the incisor and cuspid teeth. Synonym: linguocervical ridge. (05 Mar 2000) |
| linguogingival ridge | A ridge occurring on the lingual surface, near the cervix, of the incisor and cuspid teeth. Synonym: linguocervical ridge. (05 Mar 2000) |
| absent nasal septum | <radiology> Cocaine, Wegener's (midline lethal granuloma), surgery, trauma, syphilis, sarcoid (12 Dec 1998) |
| accessory nasal cartilages | Variable small plates of cartilage located in the interval between the greater alar and lateral nasal cartilages. Synonym: cartilagines nasales accessoriae, sesamoid cartilages of nose. (05 Mar 2000) |
| anterior nasal aperture | The anterior nasal opening in the skull. Synonym: apertura piriformis, piriform opening. (05 Mar 2000) |
| anterior nasal spine | A pointed projection at the anterior extremity of the intermaxillary suture; the tip, as seen on a lateral cephalometric radiograph, is used as a cephalometric landmark. Synonym: spina nasalis anterior. (05 Mar 2000) |