• (a.) Having the nose of medium width; between leptorhine and platyrhine.
Mes'o·rhine adjective [ Meso- + Greek ..., ..., the nose.] (Anat.) Having the nose of medium width; between leptorhine and platyrhine. 
mesorrhine, mesorhine, mesorrhinian, mesorhinian 1. A person or skull having a nasal index intermediate between leptorrhine and platyrrhine. 2. Having a nose of moderate width.