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From The Collaborative International Dictionary of English v.0.48:
Morphology \Mor*phol"o*gy\, n. [Gr. morfh` form + -logy: cf. F. morphologie.] 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. [PJC] 3. (Linguistics) The branch of linguistics which studies the patterns by which words are formed from other words, including inflection, compounding, and derivation. [PJC] 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 themselves. [PJC]