rar·e·fied also rar·i·fied (rârə-fīd′)
1. Not dense; thin: the rarefied air of the high peaks.
2. Belonging to or reserved for a small select group; exclusive: accepted in the most rarefied social circles.
3. Refined or esoteric: rarefied academic theorizing; a man of rarefied appetites.
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:
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.