Source : Webster's Revised Unabridged Dictionary (1913)

Morphology \Mor*phol"o*gy\, n. [Gr. ? form + -logy: cf. F.
   morphologie.] (Biol.)
   That branch of biology which deals with the structure of
   animals and plants, treating of the forms of organs and
   describing their varieties, homologies, and metamorphoses.
   See {Tectology}, and {Promorphology}.

Source : WordNet®

morphology
     n 1: the branch of biology that deals with the structure of
          animals and plants
     2: studies of the rules for forming admissible words
     3: the admissible arrangement of sounds in words [syn: {sound
        structure}, {syllable structure}, {word structure}]
     4: the branch of geology that studies the characteristics and
        configuration and evolution of rocks and land forms [syn:
        {geomorphology}]