Webster's English Dictionary

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crystallography

crys.tal.log.ra.phy \-'la:g-r*-fe-\ n [F or NL; F cristallographie, fr. NL 
   crystallographia, fr. cryst]all- + -graphia -graphy : the science dealing 
   with the system of forms among crystals, their struc ture, and their forms 
   of aggregation