Entry 1 sense Webster, 1913 Leptorhine /(lĕp"tō̇*rīn [or] *rĭn)/ · Lep·to·rhine · IPA 01 a. Having the nose narrow; -- said especially of the skull. Opposed to platyrhine. 1. Having the nose narrow; -- said especially of the skull. Opposed to platyrhine.(Anat.)