From The Collaborative International Dictionary of English v.0.48:

Morphology \Mor*phol"o*gy\, n. [Gr. morfh` form + -logy: cf. F.
   1. (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.
      [1913 Webster]

   2. (Biol.) The form and structure of an organism.

   3. (Linguistics) The branch of linguistics which studies the
      patterns by which words are formed from other words,
      including inflection, compounding, and derivation.

   4. Specifically: The study of the patterns of inflection of
      words or word classes in any given language; the study of
      the patterns in which morphemes combine to form words, and
      the rules for combination; morphemics; as, the morphology
      of Spanish verbs; also, the inflection patterns
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