n. pl. mor·phol·o·gies
a. The branch of biology that deals with the form and structure of organisms without consideration of function.
b. The form and structure of an organism or one of its parts: the morphology of a cell; the morphology of vertebrates.
2. Linguistics The study of the structure and form of words in language or a language, including inflection, derivation, and the formation of compounds.
mor′pho·logi·cal (-fə-lŏjĭ-kəl), mor′pho·logic adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.