a·top·ic  ( ā-t ŏp ĭk)
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adj. Of, relating to, or caused by a hereditary predisposition to developing allergic reactions, such as hay fever, asthma, or urticaria, after exposure to specific antigens such as pollen, food, and insect venoms.
[From Greek atopiā, unusualness, from atopos, out of the way : a-, not; see A-1 + topos, place.]
ato·py (ătə-pē) n. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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:
Indo-European Roots
Semitic Roots
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.
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