Webster's English Dictionary

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morphology

mor.phol.o.gy \-je-\ n [G morphologie, fr. morph- + logie -logy] 1a: a 
   branch of biology that deals with the form and structure of animals a nd 
   plants 1b: the features comprised in the form and structure of an organism 
   or any  of its parts 2a: a study and description of word formation in a 
   language including infle ction, derivation, and compounding 2b: the system 
   of word-forming elements and processes in a language  3a: a study of 
   structure or form  3b: STRUCTURE, FORM  4: the external structure of rocks 
   in relation to the development of erosio nal forms or topographic features