Source : Webster's Revised Unabridged Dictionary (1913)

Promorphology \Pro`mor*phol"o*gy\, n. [Pref. pro- + morphology.]
   (Biol.)
   Crystallography of organic forms; -- a division of morphology
   created by Haeckel. It is essentially stereometric, and
   relates to a mathematical conception of organic forms. See
   {Tectology}.