part of part of has part has part characteristic of inheres in has modifier Abnormal nostril morphology Single naris 2009-05-10T10:33:56Z HP:0009932 UMLS:C0685682 Single nostril Mono nostril The single opening may occur in the midline or it can occur on one side, that is, it can be symmetric or asymmetric. Although the columella is invariably absent, this is implicit and does not need to be separately specified. Single nare The presence of only a single nostril. SNOMEDCT_US:95266003 One nostril abnormal decreased amount nose external naris