pe·nol·o·gy also poe·nol·o·gy (pē-nŏlə-jē)
The study, theory, and practice of prison management and criminal rehabilitation.
[Latin poena, penalty (from Greek poinē; see kwei-1 in the Appendix of Indo-European roots) + -LOGY.]
pe′no·logi·cal (pē′nə-lŏjĭ-kəl) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. 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.