par·a·si·tol·o·gy (păr′ə-sĭ-tŏlə-jē, -sī-)
The scientific study of parasitism.
par′a·si′to·logic (-sī′tə-lŏjĭk), par′a·si′to·logi·cal (-ĭ-kəl) 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.