One of the mysteries of the English language finally explained.
The point of intersection of a line joining the lowest points on the anterior nasal apertures with the midsagittal plane.
1920s; earliest use found in Harris Wilder (1864–1928). From French naso-spinale, feminine of naso-spinal, adjective, used and probably coined by P. Broca as the epithet of a line ‘de la racine du nez à la base de l'épine nasale’ from naso- + spinal.
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