1. Of, relating to, or characterized by: seismic.
2. Having a valence higher than that of a specified element in compounds or ions named with adjectives ending in -ous: sulfuric acid.
3. One relating to or characterized by: academic.
[Middle English, from Old French -ique, from Latin -icus and from Greek -ikos.]
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.